Python If-Else Tutorial

What is If-Else in Python?

In Python, if and else are conditional statements used to perform different actions based on whether a condition is true or false. The if block runs when the condition is true, otherwise the else block runs.

Python में if और else conditional statements हैं जो किसी condition के true या false होने पर अलग-अलग actions perform करते हैं। जब condition true होती है तो if block चलता है, अन्यथा else block चलता है।

Why Use If-Else?

If-Else statements allow your program to make decisions and execute different code depending on dynamic conditions. This helps in controlling program flow and handling various scenarios.

Syntax of If-Else in Python

if condition:
    # code runs if condition is true
else:
    # code runs if condition is false

10 Examples of If-Else Statements

Example 1: Simple If-Else

num = 10
if num > 5:
    print('Number is greater than 5')
else:
    print('Number is 5 or less')

Checks if num is greater than 5 and prints appropriate message.

Output:

Number is greater than 5

Example 2: Check Even or Odd

num = 7
if num % 2 == 0:
    print('Even number')
else:
    print('Odd number')

Checks if a number is even or odd using modulus operator.

Output:

Odd number

Example 3: Age Eligibility

age = 18
if age >= 18:
    print('Eligible to vote')
else:
    print('Not eligible to vote')

Checks if age is 18 or more to decide voting eligibility.

Output:

Eligible to vote

Example 4: Temperature Check

temp = 30
if temp > 25:
    print('It is hot')
else:
    print('It is cool')

Prints if temperature is hot or cool based on threshold.

Output:

It is hot

Example 5: Password Validation

password = 'abc123'
if len(password) >= 6:
    print('Password accepted')
else:
    print('Password too short')

Checks if password length is at least 6 characters.

Output:

Password accepted

Example 6: Grade Pass or Fail

marks = 40
if marks >= 35:
    print('Pass')
else:
    print('Fail')

Determines if marks are passing or failing based on cutoff.

Output:

Pass

Example 7: User Login Check

username = 'admin'
if username == 'admin':
    print('Welcome Admin')
else:
    print('Welcome User')

Checks username and prints different welcome messages.

Output:

Welcome Admin

Example 8: Number Sign Check

num = -10
if num >= 0:
    print('Positive or Zero')
else:
    print('Negative')

Checks if number is positive, zero, or negative.

Output:

Negative

Example 9: Check String Equality

str1 = 'Python'
str2 = 'python'
if str1 == str2:
    print('Strings are equal')
else:
    print('Strings are not equal')

Checks if two strings are exactly equal (case-sensitive).

Output:

Strings are not equal

Example 10: Multiple Conditions Using If-Else

num = 15
if num % 3 == 0 and num % 5 == 0:
    print('Divisible by both 3 and 5')
else:
    print('Not divisible by both')

Checks if number is divisible by both 3 and 5 using logical AND.

Output:

Divisible by both 3 and 5