--- a/basic-data-type/questions.rst Thu Oct 14 14:11:54 2010 +0530
+++ b/basic-data-type/questions.rst Tue Oct 19 14:26:02 2010 +0530
@@ -3,6 +3,9 @@
.. A mininum of 8 questions here (along with answers)
+.. #[Puneeth: ``Answer: Any size.``. Demarcate the answer from the
+.. question.]
+
1. How large can an integer in Python be?
Any Size.
@@ -18,11 +21,10 @@
c= 3.2 + 4.6j
-
3. Look at the following piece of code ::
- In []: f or t
- Out[]:True
+ In []: f or t
+ Out[]:True
What can you comment about the data type of f and t ?
@@ -33,12 +35,15 @@
5. Look at the following sequence ::
- In []:t=true
- NameError: name 'true' is not defined
+ In []:t=true
+ NameError: name 'true' is not defined
What might be the reason for error here?
- In this scenario , it seems the programmer wanted to create a variable t with the boolean value True with a capital T. Since no variable by the name true(small t) is known to the interpreter it gives a NameError.
+ In this scenario , it seems the programmer wanted to create a
+ variable t with the boolean value True with a capital T. Since no
+ variable by the name true(small t) is known to the interpreter it
+ gives a NameError.
6. Put the following string in a variable quotation.
@@ -48,11 +53,14 @@
7. Given a tuple ::
- tup=(7,4,2,1,3,6,5,8)
- tup[-2]
+ tup=(7,4,2,1,3,6,5,8)
+ tup[-2]
5
+.. #[Puneeth: ``Answer: Any size.``. Demarcate the answer from the
+.. question.]
+
8. What is the syntax for checking containership in Python?::
element in sequence
@@ -78,6 +86,9 @@
1. Given two lists for example,
list1=[1,2,3,4] and list2=[1,2,3,4,5,6,7] write a program to remove one list from the other.
+.. #[Puneeth: dependency LOs?]
#. Write a program to check if a string is palindrome?
+.. #[Puneeth: comparison has not been taught, has it? does this depend
+.. on any other LO?]
--- a/basic-data-type/script.rst Thu Oct 14 14:11:54 2010 +0530
+++ b/basic-data-type/script.rst Tue Oct 19 14:26:02 2010 +0530
@@ -13,16 +13,24 @@
Internal Reviewer :
External Reviewer :
Checklist OK? : <put date stamp here, if OK> [2010-10-05]
-Hello friends and welcome to the tutorial on Basic Data types and operators in Python.
+
+.. #[Puneeth: Fill in pre-requisites.]
+
+Hello friends and welcome to the tutorial on Basic Data types and operators
+in Python.
+
{{{ Show the slide containing title }}}
{{{ Show the slide containing the outline slide }}}
-In this tutorial, we shall look at::
+In this tutorial, we shall look at
* Datatypes in Python
* Operators in Python
+.. #[Puneeth: Use double colon only for code blocks.]
+.. #[Puneeth: include more details in the outline.]
+
with a little hands-on on how they can be applied to the different data types.
@@ -34,9 +42,15 @@
These are:
- * Integers
- * float and
- * Complex
+ * int for integers
+ * float for floating point numbers and
+ * complex for complex numbers
+
+.. #[Puneeth: Changed to int, float and complex.]
+
+.. #[Puneeth: Loss of consistency. You talk of built-in data types, but
+.. then you were calling them integers, floats and complex. Clean up
+.. required.]
Lets first talk about integers. ::
@@ -44,8 +58,7 @@
a
-Thats it, there we have our first integer variable a.
-
+Now, we have our first integer variable a.
If we now see ::
@@ -53,51 +66,58 @@
type(a)
<type 'int'>
-This means that a is a type of int. Being an int data structure
-in python means that there are various functions that this variable
-has to manipulate it different ways. You can explore these by doing,
+This means that a is a type of int. Being an int data structure in python
+means that there are various functions that this variable has to manipulate
+it different ways. You can explore these by doing,
a.<Tab>
-
+.. #[Puneeth: Why are we suddenly talking of limits?
+.. Something like this would be better.
+.. int data-type can hold integers of any size. for example - ]
Lets see the limits of this int.
b = 99999999999999999999
b
-As you can see even when we put a value of 9 repeated 20 times
-python did not complain. However when you asked python to print
-the number again it put a capital L at the end. Now if you check
-the type of this variable b, ::
+As you can see even when we put a value of 9 repeated 20 times python did
+not complain. However when you asked python to print the number again it
+put a capital L at the end. Now if you check the type of this variable b,
+::
type(b)
<type 'long'>
-The reason for this is that python recognizes large integer numbers
-by the data type long. However long type and integer type share there
-functions and properties.
+The reason for this is that python recognizes large integer numbers by the
+data type long. However long type and integer type share there functions
+and properties.
-Lets now try out the second type in list called float.
+.. #[Puneeth: again, the clean-up that I talked of above. Decide if you are
+.. talking about the different type of numbers and the datatypes that are
+.. used to represent them or if you are talking of the data-types and what
+.. kind of numbers they represent. I think you should choose the former.]
-Decimal numbers in python are recognized by the term float ::
+Let us now look at the float data-type.
+
+Decimal numbers in python are represented by the float data-type ::
p = 3.141592
p
-If you notice the value of output of p isn't exactly equal to p. This
-is because computer saves floating point values in a specific
-format. There is always an aproximationation. This is why we should
-never rely on equality of floating point numbers in a program.
+If you notice the value of output of p isn't exactly equal to p. This is
+because computer saves floating point values in a specific format. There is
+always an aproximationation. This is why we should never rely on equality
+of floating point numbers in a program.
The last data type in the list is complex number ::
c = 3.2+4.6j
-as simple as that so essentialy its just a combination of two floats the
-imaginary part being defined by j notation instead of i. Complex numbers have a lot of functions specific to them.
-Lets check these ::
+as simple as that so essentialy its just a combination of two floats the
+imaginary part being defined by j notation instead of i. Complex numbers
+have a lot of functions specific to them. Lets check these ::
c.<Tab>
@@ -132,21 +152,26 @@
f and t
-
-The results are explanotary in themselves.
+The results are self explanatory.
-The usage of boolean brings us to an interesting question of precendence.
-What if you want to apply one operator before another.
+.. #[Puneeth: Why does booleans bring us to precedence? I don't see the
+.. connection. Am I missing something?]
+
+The usage of boolean brings us to an interesting question of precedence.
+What if you want to apply one operator before another.
Well you can use parenthesis for precedence.
-Lets write some piece of code to check this out.
+Lets write some piece of code to check this out.::
In[]: a=False
In[]: b=True
In[]: c=True
-To check how precedence changes with parenthesis. We will try two
+
+.. #[Puneeth: Consistency. In[]: is not present at other places.]
+
+To check how precedence changes with parenthesis, we will try two
expressions and their evaluation.
one ::
@@ -162,19 +187,24 @@
gives the value False.
-Lets now look at some operators available in Python to manipulate these data types.
+Let's now look at some operators available in Python to manipulate
+these data types.
-
+.. #[Puneeth: A mention of other operators would be good? Starting
+.. with % and ** is a bit weird.]
Python uses % for modulo operation ::
87 % 6
+
and two stars for a exponent. ::
7**8
-In case one wishes to use the current value of variable in which the result is stored in the expression one can do that by putting the operator before `equal to`. ::
+In case one wishes to use the current value of variable in which the result
+is stored in the expression one can do that by putting the operator before
+`equal to`. ::
a=73
a*=34
@@ -191,22 +221,22 @@
a=a/23
-
-Lets now discuss sequence data stypes in python. Sequence
-datatypes are those in which elements are kept in a sequential
-order. All the elements accessed using index.
+Lets now discuss sequence data types in Python. Sequence data types
+are those in which elements are kept in a sequential order. All the
+elements accessed using index.
+.. #[Puneeth: fix the last sentence - it sounds incomplete]
-{{{ slide to for memory aid }}}
+{{{ slide for memory aid }}}
-The sequence datatypes in python are ::
+The sequence datatypes in Python are ::
* list
* string
* tuple
-The list type is a container that holds a number of other
-objects, in the given order.
+The list type is a container that holds a number of other objects, in the
+given order.
We create our first list by typing ::
@@ -214,19 +244,18 @@
num_list
-Items enclosed in square brackets separated by comma
-constitutes a list.
+Items enclosed in square brackets separated by comma constitutes a list.
-Lists can store data of any type in them.
+Lists can store data of any type in them.
We can have a list something like ::
var_list = [1, 1.2, [1,2]]
var_list
-
+.. #[Puneeth: some continuity, when jumping to strings?]
-Now we will have a look at strings
+Now we will have a look at strings
type ::
@@ -243,20 +272,24 @@
In[]: l="Double quote contain's single quote"
In[]: m='''"Contain's both"'''
+.. #[Puneeth: Contain's? That's not a word!]
+
Thus, single quotes are used as delimiters usually.
-When a string contains a single quote, double quotes are used as delimiters.
-When a string quote contains both single and double quotes, triple quotes are
-used as delimiters.
+
+.. #[Puneeth: Thus?]
+
+When a string contains a single quote, double quotes are used as
+delimiters. When a string quote contains both single and double quotes,
+triple quotes are used as delimiters.
The last in the list of sequence data types is tuple.
-To create a tuple we use normal brackets '('
-unlike '[' for lists.::
+To create a tuple we use normal brackets '(' unlike '[' for lists.::
In[]: num_tuple = (1, 2, 3, 4, 5, 6, 7, 8)
-Because of their sequential property there are certain functions and
-operations we can apply to all of them.
+Because of their sequential property there are certain functions and
+operations we can apply to all of them.
@@ -273,9 +306,9 @@
In[]: num_tuple[-3]
-Indexing starts from 0 from left to right and from -1 when accessing
-lists in reverse. Thus num_list[2] refers to the third element 3.
-and greetings [-2] is the second element from the end , that is 'l'.
+Indexing starts from 0 from left to right and from -1 when accessing lists
+in reverse. Thus num_list[2] refers to the third element 3. and greetings
+[-2] is the second element from the end , that is 'l'.
@@ -287,7 +320,7 @@
In[]: t2=(3,4,6,7)
In[]: num_tuple+t2
-len function gives the length ::
+len function gives the length ::
In[]: len(num_list)
In[]: len(greeting_string)
@@ -303,7 +336,7 @@
We see that it gives True and False accordingly.
-Find maximum using max function and minimum using min::
+Find maximum using max function and minimum using min::
In[]: max(num_tuple)
In[]: min(greeting_string)
@@ -316,6 +349,8 @@
As a consequence of the order one we access a group of elements together.
This is called slicing and striding.
+.. #[Puneeth: Fix the sentence above. ]
+
First Slicing
Given a list ::
@@ -328,8 +363,9 @@
In[]: j[1:4]
-The syntax for slicing is sequence variable name square bracket
-first element index, colon, second element index.The last element however is notincluded in the resultant list::
+The syntax for slicing is, sequence variable name square bracket first
+element index, colon, second element index. The last element however is not
+included in the resultant list::
In[]: j[:4]
@@ -337,6 +373,8 @@
If first element is left blank default is from beginning and if last
element is left blank it means till the end.
+::
+
In[]: j[1:]
In[]: j[:]
@@ -351,12 +389,13 @@
new_num_list[1:8:2]
[2, 4, 6, 8]
-The colon two added in the end signifies all the alternate elements. This is why we call this concept
-striding because we move through the list with a particular stride or step. The step in this example
-being 2.
+The colon two added in the end signifies all the alternate elements. This
+is why we call this concept striding because we move through the list with
+a particular stride or step. The step in this example being 2.
-We have talked about many similar features of lists, strings and tuples. But there are many important
-features in lists that differ from strings and tuples. Lets see this by example.::
+We have talked about many similar features of lists, strings and tuples.
+But there are many important features in lists that differ from strings and
+tuples. Lets see this by example.::
In[]: new_num_list[1]=9
In[]: greeting_string[1]='k'
@@ -365,18 +404,21 @@
-As you can see while the first command executes with out a problem there is an error on the second one.
+As you can see while the first command executes with out a problem there is
+an error on the second one.
Now lets try ::
In[]: new_tuple[1]=5
-Its the same error. This is because strings and tuples share the property of being immutable.
-We cannot change the value at a particular index just by assigning a new value at that position.
+Its the same error. This is because strings and tuples share the property
+of being immutable. We cannot change the value at a particular index just
+by assigning a new value at that position.
-We have looked at different types but we need to convert one data type into another. Well lets one
-by one go through methods by which we can convert one data type to other:
+We have looked at different types but we need to convert one data type into
+another. Well lets one by one go through methods by which we can convert
+one data type to other:
We can convert all the number data types to one another ::
@@ -384,21 +426,25 @@
d=float(i)
d
-Python has built in functions int, float and complex to convert one number type
-data structure to another.
+Python has built in functions int, float and complex to convert one number
+type data structure to another.
+
+::
dec=2.34
dec_con=int(dec)
dec_con
-As you can see the decimal part of the number is simply stripped to get the integer.::
+As you can see the decimal part of the number is simply stripped to get the
+integer.::
com=2.3+4.2j
float(com)
com
-In case of complex number to floating point only the real value of complex number is taken.
+In case of complex number to floating point only the real value of complex
+number is taken.
Similarly we can convert list to tuple and tuple to list ::
@@ -407,15 +453,17 @@
tupl=(3,23,4,56)
lst=list(tuple)
-However string to list and list to string is an interesting problem.
-Lets say we have a string ::
+However converting a string to a list and a list to a string is an
+interesting problem. Let's say we have a string ::
In: somestring="Is there a way to split on these spaces."
In: somestring.split()
-This produces a list with the string split at whitespace.
-similarly we can split on some other character.
+This produces a list with the string split at whitespace. Similarly we can
+split on some other character.
+
+::
In: otherstring="Tim,Amy,Stewy,Boss"
@@ -464,4 +512,10 @@
Thank You.
-
+..
+ Local Variables:
+ mode: rst
+ indent-tabs-mode: nil
+ sentence-end-double-space: nil
+ fill-column: 75
+ End: