Unit 3: Python Programming Selection Statements Part 2 – AI Made Easy for Class 11 CBSE 2025

In this tutorial, we will continue our discussion on Selection Statements in Python programming. We will cover the concepts of Nested Selection Statements and the use of Logical Operators in making complex decisions in programs.

Nested Selection Statements:

Nested selection statements are used when we need to make multiple decisions based on multiple conditions. In Python, we can nest if-else statements within another if-else statement to handle such situations. The syntax for a nested selection statement is as follows:

if condition1:
    if condition2:
        # code to be executed if condition1 and condition2 are true
    else:
        # code to be executed if condition1 is true but condition2 is false
else:
    # code to be executed if condition1 is false

Let’s understand this with an example:

x = 10
if x > 0:
    if x % 2 == 0:
        print("x is a positive even number")
    else:
        print("x is a positive odd number")
else:
    print("x is not a positive number")

In this example, if x is greater than 0, we check if it is even or odd, and if it is not positive, we print that it is not a positive number. This is an example of a nested selection statement.

Logical Operators:

Logical operators are used to combine multiple conditions in a selection statement. Python supports three logical operators: and, or, and not. These operators are used to check if two or more conditions are true, or to reverse the result of a condition. The logical operators work as follows:

• and: Returns True if both conditions are true
• or: Returns True if at least one of the conditions is true
• not: Returns the opposite of the condition

Let’s see how logical operators can be used in a selection statement:

x = 10
y = 5

if x > 0 and y > 0:
    print("Both x and y are positive")

if x > 0 or y > 0:
    print("At least one of x or y is positive")

if not(x < 0):
    print("x is not negative")

In this example, we use the logical operators to check if both x and y are positive, at least one of them is positive, and if x is not negative.

With the knowledge of nested selection statements and logical operators, you can now make more complex decisions in your Python programs. Practice writing and executing programs using these concepts to reinforce your understanding.

That’s all for this tutorial on Selection Statements in Python. Stay tuned for more tutorials on Python programming!