NCERT Class 11 Informative Practices Working With Lists and Dictionaries

Read and download NCERT Class 11 Informative Practices Working With Lists and Dictionaries in NCERT book for Class 11 Informatics Practices. You can download latest NCERT eBooks chapter wise in PDF format free from Studiestoday.com. This Informatics Practices textbook for Class 11 is designed by NCERT and is very useful for students. Please also refer to the NCERT solutions for Class 11 Informatics Practices to understand the answers of the exercise questions given at the end of this chapter

NCERT Book for Class 11 Informatics Practices Chapter 4 Working with Lists and Dictionaries

Class 11 Informatics Practices students should refer to the following NCERT Book Chapter 4 Working with Lists and Dictionaries in Class 11. This NCERT Book for Class 11 Informatics Practices will be very useful for exams and help you to score good marks

Chapter 4 Working with Lists and Dictionaries NCERT Book Class 11

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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NCERT Book Class 11 Informatics Practices Chapter 4 Working with Lists and Dictionaries

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