Python If Else Statements – Conditional Statements

In Python, if-else statements are used to execute certain blocks of code based on whether a condition is true or false. These are essential for decision-making in programs.

Syntax of if-else statement:

Basic Example:

Output:

In this case, since age is 18, the condition age >= 18 evaluates to true, and the code inside the if block is executed.

Using elif (Else If) for multiple conditions:

You can also check multiple conditions using elif (short for “else if”). The first condition that’s true will execute, and the others will be skipped.

Output:

In this example, the first condition age >= 18 is false, so it checks the elif condition age >= 13, which is true.

Nested if Statements:

You can nest if-else statements inside each other for more complex decision-making.

Output:

Comparison Operators:

You can use comparison operators to check conditions:

• == : Equal to
• != : Not equal to
• > : Greater than
• < : Less than
• >= : Greater than or equal to
• <= : Less than or equal to

Logical Operators:

You can combine multiple conditions using logical operators:

• and: Both conditions must be true.
• or: At least one condition must be true.
• not: Negates a condition (i.e., if it’s true, it becomes false and vice versa).

Examples:

Using and:

Output:

Using or:

Output:

Using not:

Output:

Summary:

• if checks if a condition is true and executes the associated block.
• elif checks additional conditions if the previous conditions are false.
• else executes when all previous conditions are false.
• Logical operators (and, or, not) help combine conditions.
• You can nest if-else statements to handle complex logic.

These statements allow you to implement conditional logic and control the flow of your Python programs effectively.