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

A dictionary in Python is declared using curly braces, with each key-value pair separated by a colon and pairs separated by commas. The keys are the identifiers you use to access the values, and in this case the roll numbers 1, 2, and 3 serve as keys while the student names are the corresponding values.

The statement is:

ClassRoll = {1: 'Reena', 2: 'Rakesh', 3: 'Zareen'} …

Dictionaries are one of Python's most powerful built-in data structures, designed to store data as key-value pairs rather than in a simple sequence. Think of them as a real-world dictionary where you look up a word (the key) to find its meaning (the value), or in this case, a roll number to find a student's name.

The syntax is straightforward. You enclose the entire collection in curly braces {}, and inside, each key is linked to its value with a colon :. Multiple pairs are separated by commas. The keys here are integers (1, 2, 3) representing roll numbers, and the values are strings ('Reena', 'Rakesh', 'Zareen') representing student names.

Here's the complete statement:

ClassRoll = {1: 'Reena', 2: 'Rakesh', 3: 'Zareen'}
``` …