author | Puneeth Chaganti <punchagan@fossee.in> |
Thu, 02 Dec 2010 14:43:42 +0530 | |
changeset 523 | 54bdda4aefa5 |
parent 522 | d33698326409 |
permissions | -rw-r--r-- |
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.. Objectives |
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.. ---------- |
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.. At the end of this tutorial, you should know -- |
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.. 1. Learn about Python Data Structures and Operators.(Remembering) |
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.. #.Use them to do basic operations.(Applying) |
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.. Prerequisites |
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.. ------------- |
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.. None |
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.. Author : Amit Sethi |
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Internal Reviewer : |
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External Reviewer : |
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Checklist OK? : <put date stamp here, if OK> [2010-10-05] |
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|
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Hello friends and welcome to the tutorial on Basic Data types and operators |
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in Python. |
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|
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{{{ Show the slide containing title }}} |
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|
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{{{ Show the slide containing the outline slide }}} |
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|
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In this tutorial, we shall look at |
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* Datatypes in Python |
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* Numbers |
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* Boolean |
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* Sequence |
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* Operators in Python |
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* Arithmetic Operators |
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* Boolean Operators |
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* Python Sequence Data types |
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* list |
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* string |
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* tuple |
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First we will explore python data structures in the domain of numbers. |
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There are three built-in data types in python to represent numbers. |
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{{{ A slide to make a memory note of the different datatypes }}} |
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These are: |
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* int |
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* float |
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* complex |
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Lets first talk about int. :: |
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a = 13 |
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a |
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Now, we have our first int variable a. |
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If we now see :: |
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type(a) |
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<type 'int'> |
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This means that a is a type of int. There are lot of functions associated |
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with the int datatype, to manipulate it in different ways. These can be |
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explored by doing, :: |
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a.<Tab> |
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*int* datatype can hold integers of any size lets see this by an example. |
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:: |
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b = 99999999999999999999 |
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b |
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As you can see even when we put a value of 9 repeated 20 times python did |
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not complain. This is because python's int data-type can hold integers of any |
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size. |
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Let us now look at the float data-type. |
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Decimal numbers in python are represented by the float data-type :: |
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p = 3.141592 |
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p |
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If you notice the value of output of ``p`` isn't exactly equal to ``p``. |
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This is because computer saves floating point values in a specific format. |
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There is always an approximation. This is why we should never rely on |
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equality of floating point numbers in a program. |
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The last data type in the list is complex number :: |
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c = 3.2+4.6j |
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as simple as that so essentialy its just a combination of two floats the |
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imaginary part being defined by j notation instead of i. Complex numbers |
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have a lot of functions specific to them. Let us look at these :: |
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c.<Tab> |
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Lets try some of them :: |
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c.real |
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c.imag |
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c.real gives the real part of the number and c.imag the imaginary. |
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We can get the absolute value using the function :: |
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abs(c) |
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Following is are exercises that you must do. |
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%% %% Find the absolute value of 3+4j |
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:: |
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|
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abs(3+4j) |
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|
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%% %% What is the datatype of number 999999999999999999? Is it |
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not int? |
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:: |
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|
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Long |
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Big integers are internally stored in python |
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as Long datatype. |
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|
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131 |
Please, pause the video here. Do the exercises and then continue. |
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{{ Slide for showing Boolean datatypes }} |
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135 |
|
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Python also has Boolean as a built-in type. |
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|
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138 |
Try it out just type :: |
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139 |
|
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140 |
t = True |
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141 |
|
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note that T in true is capitalized. |
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143 |
|
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You can apply different Boolean operations on t now for example :: |
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|
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f = not t |
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f |
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f or t |
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f and t |
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|
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|
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152 |
The results are self explanatory. |
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|
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What if you want to apply one operator before another. |
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155 |
|
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156 |
Well you can use parenthesis for precedence. |
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157 |
|
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158 |
Lets write some piece of code to check this out.:: |
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159 |
|
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160 |
a=False |
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b=True |
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162 |
c=True |
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163 |
|
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164 |
|
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165 |
To check how precedence changes with parenthesis, we will try two |
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166 |
expressions and their evaluation. |
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167 |
|
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168 |
one :: |
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169 |
|
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170 |
(a and b) or c |
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171 |
|
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172 |
This expression gives the value True |
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173 |
|
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174 |
where as the expression :: |
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175 |
|
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176 |
a and (b or c) |
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177 |
|
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178 |
gives the value False. |
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179 |
|
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180 |
|
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181 |
Let's now look at some operators available in Python to manipulate |
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182 |
these data types. |
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183 |
|
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184 |
Python uses '+' for addition :: |
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185 |
|
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186 |
23 + 74 |
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187 |
|
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188 |
'-' for subtraction :: |
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189 |
|
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190 |
23 - 56 |
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191 |
|
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192 |
'*' for multiplication :: |
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193 |
|
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194 |
45*76 |
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195 |
|
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196 |
'/' for division :: |
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197 |
|
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198 |
384/16 |
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199 |
8/3 |
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200 |
8.0/3 |
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201 |
|
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202 |
When we did 8/3 the first case results in am integer |
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203 |
output as both the operands are integer however when |
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204 |
8.0/3 is used the answer is float as one of the operands is |
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205 |
float. |
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206 |
|
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|
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208 |
'%' for modulo operation :: |
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209 |
|
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210 |
87 % 6 |
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211 |
|
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212 |
and two stars for a exponent. :: |
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213 |
|
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214 |
7**8 |
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215 |
|
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216 |
|
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217 |
In case one wishes to use the current value of variable in which the result |
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218 |
is stored in the expression one can do that by putting the operator before |
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219 |
`equal to`. :: |
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220 |
|
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221 |
a=73 |
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222 |
a*=34 |
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223 |
|
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224 |
is same as :: |
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225 |
|
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226 |
a=a*34 |
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227 |
|
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228 |
and :: |
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229 |
|
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230 |
a/=23 |
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231 |
|
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232 |
is same as :: |
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233 |
|
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234 |
a=a/23 |
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235 |
|
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236 |
Following is are exercises that you must do. |
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237 |
|
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238 |
%% %% Using python find sqaure root of 3? |
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%% %% Is 3**1/2 and 3**0.5 same |
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Please, pause the video here. Do the exercises and then continue. |
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:: |
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3**0.5 |
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:: |
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No,One gives an int answer and the other float |
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Lets now discuss sequence data types in Python. Sequence data types |
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are those in which elements are kept in a sequential order and all the |
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elements are accessed using index numbers. |
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{{{ slide introducing sequence datatype }}} |
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The sequence datatypes in Python are :: |
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* list |
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* string |
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* tuple |
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The list type is a container that holds a number of other objects, in the |
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given order. |
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We create our first list by typing :: |
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num_list = [1, 2, 3, 4] |
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num_list |
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Items enclosed in square brackets separated by comma constitutes a list. |
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Lists can store data of any type in them. |
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We can have a list something like :: |
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var_list = [1, 1.2, [1,2]] |
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var_list |
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Lets look at another sequence data type, strings |
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type :: |
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greeting_string="hello" |
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greeting_string is now a string variable with the value "hello" |
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{{{ All the different types of strings shown }}} |
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Python strings can actually be defined in three different ways :: |
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k='Single quote' |
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l="Let's see how to include a single quote" |
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m='''"Let's see how to include both"''' |
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As you can see, single quotes are used as delimiters usually. |
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When a string contains a single quote, double quotes are used as |
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delimiters. When a string quote contains both single and double quotes, |
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triple quotes are used as delimiters. |
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The last in the list of sequence data types is tuple. |
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To create a tuple we use normal brackets '(' unlike '[' for lists.:: |
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num_tuple = (1, 2, 3, 4, 5, 6, 7, 8) |
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Because of their sequential property there are certain functions and |
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operations we can apply to all of them. |
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The first one is accessing. |
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They can be accessed using index numbers :: |
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num_list[2] |
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num_list[-1] |
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greeting_string[1] |
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greeting_string[3] |
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greeting_string[-2] |
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num_tuple[2] |
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num_tuple[-3] |
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Indexing starts from 0 from left to right and from -1 when accessing lists |
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in reverse. Thus num_list[2] refers to the third element 3. and greetings |
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[-2] is the second element from the end , that is 'l'. |
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Addition gives a new sequence containing both sequences :: |
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num_list+var_list |
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a_string="another string" |
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greeting_string+a_string |
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t2=(3,4,6,7) |
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num_tuple+t2 |
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len function gives the length :: |
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len(num_list) |
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len(greeting_string) |
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len(num_tuple) |
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Prints the length the variable. |
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We can check the containership of an element using the 'in' keyword :: |
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3 in num_list |
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'H' in greeting_string |
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2 in num_tuple |
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changeset
|
356 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
357 |
We see that it gives True and False accordingly. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
358 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
359 |
Find maximum using max function and minimum using min:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
360 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
361 |
max(num_tuple) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
362 |
min(greeting_string) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
363 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
364 |
Get a sorted list :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
365 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
366 |
sorted(num_list) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
367 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
368 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
369 |
As a consequence of their order, we can access a group of elements in a |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
370 |
sequence, together. This is called slicing and striding. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
371 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
372 |
First lets discuss Slicing, |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
373 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
374 |
Given a list :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
375 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
376 |
j=[1,2,3,4,5,6] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
377 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
378 |
Lets say we want elements starting from 2 and ending in 5. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
379 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
380 |
For this we can do :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
381 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
382 |
j[1:4] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
383 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
384 |
The syntax for slicing is, sequence variable name square bracket first |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
385 |
element index, colon, second element index. The last element however is not |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
386 |
included in the resultant list:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
387 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
388 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
389 |
j[:4] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
390 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
391 |
If first element is left blank default is from beginning and if last |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
392 |
element is left blank it means till the end. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
393 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
394 |
:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
395 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
396 |
j[1:] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
397 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
398 |
j[:] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
399 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
400 |
This effectively is the whole list. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
401 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
402 |
Striding is similar to slicing except that the step size here is not one. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
403 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
404 |
Lets see by example :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
405 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
406 |
new_num_list=[1,2,3,4,5,6,7,8,9,10] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
407 |
new_num_list[1:8:2] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
408 |
[2, 4, 6, 8] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
409 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
410 |
The colon two added in the end signifies all the alternate elements. This |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
411 |
is why we call this concept striding because we move through the list with |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
412 |
a particular stride or step. The step in this example being 2. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
413 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
414 |
We have talked about many similar features of lists, strings and tuples. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
415 |
But there are many important features in lists that differ from strings and |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
416 |
tuples. Lets see this by example.:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
417 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
418 |
new_num_list[1]=9 |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
419 |
greeting_string[1]='k' |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
420 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
421 |
{{{ slide to show the error }}} |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
422 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
423 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
424 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
425 |
As you can see while the first command executes with out a problem there is |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
426 |
an error on the second one. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
427 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
428 |
Now lets try :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
429 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
430 |
new_tuple[1]=5 |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
431 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
432 |
Its the same error. This is because strings and tuples share the property |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
433 |
of being immutable. We cannot change the value at a particular index just |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
434 |
by assigning a new value at that position. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
435 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
436 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
437 |
We have looked at different types but we need to convert one data type into |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
438 |
another. Well lets one by one go through methods by which we can convert |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
439 |
one data type to other: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
440 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
441 |
We can convert all the number data types to one another :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
442 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
443 |
i=34 |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
444 |
d=float(i) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
445 |
d |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
446 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
447 |
Python has built in functions int, float and complex to convert one number |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
448 |
type data structure to another. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
449 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
450 |
:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
451 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
452 |
dec=2.34 |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
453 |
dec_con=int(dec) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
454 |
dec_con |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
455 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
456 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
457 |
As you can see the decimal part of the number is simply stripped to get the |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
458 |
integer.:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
459 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
460 |
com=2.3+4.2j |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
461 |
float(com) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
462 |
com |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
463 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
464 |
In case of complex number to floating point only the real value of complex |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
465 |
number is taken. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
466 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
467 |
Similarly we can convert list to tuple and tuple to list :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
468 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
469 |
lst=[3,4,5,6] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
470 |
tup=tuple(lst) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
471 |
tupl=(3,23,4,56) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
472 |
lst=list(tuple) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
473 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
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parents:
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changeset
|
474 |
However converting a string to a list and a list to a string is an |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
475 |
interesting problem. Let's say we have a string :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
476 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
477 |
In: somestring="Is there a way to split on these spaces." |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
478 |
In: somestring.split() |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
479 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
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parents:
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changeset
|
480 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
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parents:
diff
changeset
|
481 |
This produces a list with the string split at whitespace. Similarly we can |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
482 |
split on some other character. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
483 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
484 |
:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
485 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
486 |
In: otherstring="Tim,Amy,Stewy,Boss" |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
487 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
488 |
How do we split on comma , simply pass it as argument :: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
489 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
490 |
In: otherstring.split(',') |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
491 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
492 |
join function does the opposite. Joins a list to make a string.:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
493 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
494 |
','.join['List','joined','on','commas'] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
495 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
496 |
Thus we get a list joined on commas. Similarly we can do spaces.:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
497 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
498 |
' '.join['Now','on','spaces'] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
499 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
500 |
Note that the list has to be a list of strings to apply join operation. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
501 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
502 |
With this we come to the end of this tutorial . |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
503 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
504 |
Following is an (are) exercise(s) that you must do. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
505 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
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changeset
|
506 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
507 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
508 |
%% %% Check if 3 is an element of the list [1,7,5,3,4]. In case |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
509 |
it is change it to 21. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
510 |
:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
511 |
l=[1,7,5,3,4] |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
512 |
3 in l |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
513 |
l[3]=21 |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
514 |
l |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
515 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
516 |
%% %% Convert the string "Elizabeth is queen of england" to |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
517 |
"Elizabeth is queen" |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
518 |
:: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
519 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
520 |
s="Elizabeth is queen of england" |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
521 |
stemp=s.split() |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
522 |
' '.join(stemp[:3]) |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
523 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
524 |
Please, pause the video here. Do the exercise(s) and then continue. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
525 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
526 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
527 |
This brings us to the end of the tutorial. In this tutorial we have |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
528 |
discussed |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
529 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
530 |
1. Number Datatypes , integer,float and complex |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
531 |
2. Boolean and datatype and operators |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
532 |
3. Sequence data types ,List,String and Tuple |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
533 |
4. Accesing sequence |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
534 |
5. Slicing sequences |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
535 |
6. Finding length , sorting and reversing operations on sequences. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
536 |
7. Immutability. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
537 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
538 |
{{{ Show the "sponsored by FOSSEE" slide }}} |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
539 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
540 |
This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
541 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
542 |
Hope you have enjoyed and found it useful. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
543 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
544 |
Thank You. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
545 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
546 |
|
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
547 |
.. |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
548 |
Local Variables: |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
549 |
mode: rst |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
550 |
indent-tabs-mode: nil |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
551 |
sentence-end-double-space: nil |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
552 |
fill-column: 75 |
d33698326409
Renamed all LOs to match with their names in progress.org.
Puneeth Chaganti <punchagan@fossee.in>
parents:
diff
changeset
|
553 |
End: |