author | Puneeth Chaganti <punchagan@fossee.in> |
Thu, 11 Nov 2010 09:34:21 +0530 | |
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.. Objectives |
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.. ---------- |
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.. 8.1 LO: getting started with functions (3) |
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.. At the end of this tutorial, you will be able to |
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.. 1. define function |
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.. #. define functions with arguments |
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.. #. learn about docstrings |
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.. #. learn about return values |
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.. can return multiple values |
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.. #. read code |
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.. Prerequisites |
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.. ------------- |
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.. 1. should have ``ipython`` installed. |
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.. #. getting started with ``ipython``. |
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.. Author : Anoop Jacob Thomas <anoop@fossee.in> |
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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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Getting started with functions |
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============================== |
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{{{ show welcome slide }}} |
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Hello and welcome to the tutorial, getting started with functions. |
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{{{ switch to next slide, outline slide }}} |
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In this tutorial we will learn about functions in python, how to |
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define functions, passing arguments to functions, docstrings, and |
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function return value. |
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{{{ switch to next slide, Function }}} |
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While writing code, we would like to reduce the number of lines of |
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code and using functions is a way of reusing the code. A function is |
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a portion of code within a larger program that performs a specific |
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task and is relatively independent of the remaining code. Now let us |
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get more familiar with functions, |
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{{{ switch to next slide, f(x) a mathematical function }}} |
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Consider a mathematical function f(x) = x squared. Here x is a |
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variable and with different values of x the value of function will |
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change. When x is one f(1) will return the value 1 and f(2) will |
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return us the value 4. Let us now see how to define the function f(x) |
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in Python. |
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{{{ switch to next slide, define f(x) in Python }}} |
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In your Ipython interpreter type the following, |
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:: |
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def f(x): |
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return x*x |
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Let us see, if the function ``f``, we defined, works as we expect. |
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:: |
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f(1) |
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f(2) |
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Yes, it returned 1 and 2 respectively. |
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Now, let us see what we did. The first line ``def f(x)`` is used to |
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define the name and the parameters to the function. ``def`` is a |
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keyword and ``f`` is the name of the function and ``x`` the parameter |
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of the function. |
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The second line is the body of the function. Incidentally, this |
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function has a single line definition. Note that the body of the |
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function is indented, just like any other code block, in Python. |
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{{{ switch to next slide, problem statement 1 }}} |
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%% 1 %% Write a python function named cube which computes the cube of |
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a given number n. |
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Pause here and try to solve the problem yourself. |
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{{{ switch to next slide, solution }}} |
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The problem can be solved as, |
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def cube(n): |
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return n**3 |
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Now let us see how to write functions without arguments. |
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{{{ switch to next slide, greet function }}} |
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Let us define a new function called ``greet`` which will print ``Hello |
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World``. |
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def greet(): |
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print "Hello World!" |
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Now try calling the function, |
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:: |
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greet() |
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Well that is a function which takes no arguments. Also note that it is |
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not mandatory for a function to return values. The function ``greet`` |
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neither takes any argument nor returns any value. |
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Now let us see how to write functions with more than one argument. |
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{{{ switch to next slide, exercise 2 }}} |
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%% 2 %% Write a python function named ``avg`` which computes the |
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average of ``a`` and ``b``. |
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Pause here and try to solve the problem yourself. |
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127 |
|
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128 |
{{{ switch to next slide, solution 2 }}} |
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129 |
|
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130 |
The problem can be solved as shown, |
444
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131 |
:: |
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132 |
|
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133 |
def avg(a,b): |
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134 |
return (a + b)/2 |
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135 |
|
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136 |
Thus if we want a function to accept more arguments, we just list them |
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137 |
separated with a comma between the parenthesis after the function name |
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138 |
in the ``def`` line. |
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139 |
|
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140 |
{{{ switch to next slide, docstring }}} |
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141 |
|
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142 |
It is always a good practice to document the code that we write, and |
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143 |
for a function we define we should write an abstract of what the |
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|
144 |
function does, and that is called a doc-string. Let us modify the |
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145 |
function ``avg`` and add doc-string to it. Do the following, |
444
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146 |
:: |
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147 |
|
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148 |
def avg(a,b): |
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149 |
""" avg takes two numbers as input (a & b), and |
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150 |
returns the average of a and b""" |
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151 |
return (a+b)/2 |
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152 |
|
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|
153 |
Note that doc-strings are entered in the immediate line after the |
444
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154 |
function definition and put as a triple quoted string. And here as far |
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155 |
as the code functionality is concerned, we didn't do anything. We just |
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156 |
added an abstract of what the function does. |
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157 |
|
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158 |
Now try this in the ipython interpreter. |
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159 |
:: |
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|
160 |
|
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161 |
avg? |
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162 |
|
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163 |
It displays the docstring as we gave it. Thus docstring is a good way |
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164 |
of documenting the function we write. |
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165 |
|
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|
166 |
Try to do this, |
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|
167 |
:: |
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|
168 |
|
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169 |
f? |
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|
170 |
|
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|
171 |
It doesn't have a docstring associated with it. Also we cannot infer |
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|
172 |
anything from the function name, and thus we are forced to read the |
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173 |
code to understand anything about the function. |
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|
174 |
|
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|
175 |
{{{ switch to next slide, exercise 3 }}} |
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176 |
|
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177 |
%% 3 %% Add docstring to the function f. |
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|
178 |
|
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179 |
Pause here and try to do it yourself. |
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|
180 |
|
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|
181 |
{{{ switch to next slide, solution }}} |
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|
182 |
|
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|
183 |
We need to define the function again to add docstring to the function |
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|
184 |
``f`` and we do it as, |
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|
185 |
:: |
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|
186 |
|
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|
187 |
def f(x): |
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|
188 |
"""Accepts a number x as argument and, |
1aa91f8d8d59
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|
189 |
returns the square of the number x.""" |
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|
190 |
return x*x |
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|
191 |
|
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|
192 |
{{{ switch to next slide, exercise 4 }}} |
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|
193 |
|
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|
194 |
%% 4 %% Write a python function named ``circle`` which returns the |
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|
195 |
area and perimeter of a circle given radius ``r``. |
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|
196 |
|
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|
197 |
Pause here and try to solve the problem yourself. |
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|
198 |
|
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|
199 |
{{{ switch to next slide, solution 4 }}} |
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|
200 |
|
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|
201 |
The problem requires us to return two values instead of one which we |
1aa91f8d8d59
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|
202 |
were doing till now. We can solve the problem as, |
1aa91f8d8d59
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parents:
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|
203 |
:: |
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|
204 |
|
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|
205 |
def circle(r): |
1aa91f8d8d59
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parents:
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|
206 |
"""returns area and perimeter of a circle given radius r""" |
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parents:
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|
207 |
pi = 3.14 |
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|
208 |
area = pi * r * r |
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parents:
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|
209 |
perimeter = 2 * pi * r |
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|
210 |
return area, perimeter |
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|
211 |
|
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|
212 |
A python function can return any number of values. There is no |
1aa91f8d8d59
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|
213 |
restriction for it. |
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|
214 |
|
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parents:
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|
215 |
Let us call the function ``circle`` as, |
1aa91f8d8d59
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parents:
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|
216 |
:: |
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|
217 |
|
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|
218 |
a, p = circle(6) |
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|
219 |
print a |
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|
220 |
print p |
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|
221 |
|
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|
222 |
Now we have done enough coding, let us do some code reading exercise, |
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|
223 |
|
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|
224 |
{{{ switch to next slide, what }}} |
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|
225 |
|
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|
226 |
What does the function ``what`` do? |
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|
227 |
|
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|
228 |
.. def what( n ): |
1aa91f8d8d59
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|
229 |
.. if n < 0: n = -n |
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|
230 |
.. while n > 0: |
1aa91f8d8d59
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parents:
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|
231 |
.. if n % 2 == 1: |
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|
232 |
.. return False |
1aa91f8d8d59
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|
233 |
.. n /= 10 |
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parents:
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|
234 |
.. return True |
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parents:
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|
235 |
|
1aa91f8d8d59
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parents:
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|
236 |
Pause here and try to figure out what the function ``what`` does. |
1aa91f8d8d59
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parents:
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|
237 |
|
1aa91f8d8d59
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parents:
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|
238 |
{{{ switch to next slide, even_digits }}} |
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parents:
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|
239 |
|
1aa91f8d8d59
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|
240 |
.. def even_digits( n ): |
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|
241 |
.. """returns True if all the digits of number n is even |
1aa91f8d8d59
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|
242 |
.. returns False if all the digits of number n is not even""" |
1aa91f8d8d59
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parents:
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|
243 |
.. if n < 0: n = -n |
1aa91f8d8d59
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parents:
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|
244 |
.. while n > 0: |
1aa91f8d8d59
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parents:
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|
245 |
.. if n % 2 == 1: |
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parents:
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|
246 |
.. return False |
1aa91f8d8d59
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|
247 |
.. n /= 10 |
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|
248 |
.. return True |
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|
249 |
|
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|
250 |
The function returns ``True`` if all the digits of the number ``n`` |
1aa91f8d8d59
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parents:
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|
251 |
are even, otherwise it returns ``False``. |
1aa91f8d8d59
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|
252 |
|
1aa91f8d8d59
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|
253 |
Now one more code reading exercise, |
1aa91f8d8d59
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parents:
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|
254 |
|
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parents:
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|
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{{{ switch to next slide, what }}} |
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What does the function ``what`` do? |
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.. def what( n ): |
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.. i = 1 |
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.. while i * i < n: |
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.. i += 1 |
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.. return i * i == n, i |
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Pause here and try to figure out what the function ``what`` does. |
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{{{ switch to next slide, is_perfect_square }}} |
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.. def is_perfect_square( n ): |
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.. """returns True and square root of n, if n is a perfect square, |
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.. otherwise returns False and the square root of the |
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.. next perfect square""" |
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.. i = 1 |
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.. while i * i < n: |
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.. i += 1 |
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.. return i * i == n, i |
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The function returns ``True`` and the square root of ``n`` if n is a |
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perfect square, otherwise it returns ``False`` and the square root of |
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the next perfect square. |
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This brings us to the end of this tutorial, in this tutorial we covered |
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{{{ switch to next slide, summary }}} |
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- Functions in Python |
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- Passing parameters to a function |
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- Returning values from a function |
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We also did few code reading exercises. |
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{{{ Show the "sponsored by FOSSEE" slide }}} |
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This tutorial was created as a part of FOSSEE project, NME ICT, MHRD India |
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Hope you have enjoyed and found it useful. |
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Thank you! |