Python if...else

In Python, if...else statements are used to execute a different set of statements based on a condition. The basic syntax of an if...else statement in Python is:

if condition:
    # execute this block of code if the condition is True
else:
    # execute this block of code if the condition is False

Here, the condition can be any expression that evaluates to either True or False. If the condition is True, the first block of code (indented after the if statement) is executed, otherwise, the second block of code (indented after the else statement) is executed.

Optionally, you can also use elif statements to check for multiple conditions. The basic syntax of an if...elif...else statement in Python is:

if condition1:
    # execute this block of code if condition1 is True
elif condition2:
    # execute this block of code if condition1 is False and condition2 is True
else:
    # execute this block of code if both condition1 and condition2 are False

Here, you can add any number of elif statements to check for additional conditions. The else block is executed only if all the conditions above it are False.

Here's an example to illustrate the use of if...else in Python:

x = 5

if x > 10:
    print("x is greater than 10")
else:
    print("x is less than or equal to 10")

Output:

x is less than or equal to 10

In this example, the condition x > 10 is False, so the second block of code (after the else statement) is executed, which prints the message "x is less than or equal to 10".