Question

Write a Python statement to declare a Dictionary named ClassRoll with Keys as 1, 2, 3 and corresponding values as ‘Reena’, ‘Rakesh’, ‘Zareen’ respectively.

Answer 1

There could be two ways.

Way 1:

$>>>\ \tt ClassRoll\ =\ \{1:'Reena',\ 2:'Rakesh',\ 3:'Zareen'\}$

Way 2:

$>>>\ \tt ClassRoll\ =\ dict()\\>>>\ ClassRoll[1]\ =\ 'Reena'\\>>>\ ClassRoll[2]\ =\ 'Rakesh'\\>>>\ ClassRoll[3]\ =\ 'Zareen'$

In the first method, we directly assign the values to the variable, using curly brackets, making it a dictionary.

In the second method, we first decide the data type of the variable ClassRoll and then assign values in to it.

A dictionary is a data type in Python that enables a key-value relationship. All dictionaries are enclosed in curly brackets. The format of a dictionary is as follows:

• Dictionary_name = {Key1:Value1, Key2:Value2, Key3:Value3, ... }

In a dictionary, the elements can be accessed using their keys, that act as indexes.

Dictionary_name[Key1] would return the value corresponding to Key1, i.e., Value1. The same goes for all the other keys. If an unknown key has been called, it would render an error.