NCERT Book Class 11 Informative Practices Working With Lists and Dictionaries

Informatics Practices
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Official NCERT Book for Class 11 Informatics Practices: Chapter 04 Working with Lists and Dictionaries

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Chapter-wise Study Material: Chapter 04 Working with Lists and Dictionaries

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4.1 INTRODUCTION TO LIST

The data type list is an ordered sequence which is mutable and made up of one or more elements. Unlike a string which consists of only characters, a list can have elements of different data types such as integer, float, string, tuple or even another list. A list is very useful to group elements of mixed data types. Elements of a list are enclosed in square brackets and are separated by comma.

Example 4.1

#list1 is the list of six even numbers

>>> list1 = [2,4,6,8,10,12]

>>> print(list1)

[2, 4, 6, 8, 10, 12]

#list2 is the list of vowels
>>> list2 = ['a','e','i','o','u']
>>> print(list2)
['a', 'e', 'i', 'o', 'u']
#list3 is the list of mixed data types
>>> list3 = [100,23.5,'Hello']
 
>>> print(list3)
[100, 23.5, 'Hello']
#list4 is the list of lists called nested
#list
>>> list4 =[['Physics',101],['Chemistry',202],
['Mathematics',303]]
 
>>> print(list4)
[['Physics', 101], ['Chemistry', 202],
['Mathematics', 303]]


4.1.1 Accessing Elements in a List
Each element in list is accessed using value called index. The fist index value is 0, the second index is 1 and so on. Elements in the list are assigned index values in increasing order sterling from 0.
To access an element, use square brackets with the index [] value of that element. We may also use negative index value to access elements starting from the last element in the list, having index value -0.
#initialing a list named list1
>>> list1 = [2,4,6,8,10,12]
>>> list1[0] #returns first element of list1
2
>>> list1[3] #returns fourth element of list1
8
#Out of range index value for the list returns error
>>> list1[15]
IndexError: list index out of range
#an expression resulting in an integer index
>>> list1[1+4]
12
>>> list1[-1] #return first element from right
12
#length of the list1 is assigned to n
>>> n = len(list1)
>>> print(n)
6
#Get the last element of the list1
>>> list1[n-1]
12
 


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