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You can use the python if elif else statement to conditionally execute a statement or a block of statements. Conditions can be true or false. They execute one thing when the condition is true and something else when the condition is false.
Topics Covered
Comparison operators
- Equal To: a == b
- Not Equal: a != b
- Less Than: a < b
- Less Than or Equal To: a <= b
- Greater Than: a > b
- Greater Than or Equal To: a >= b
Logical operators
- b and a: True if both b and a are True. False otherwise.
- a or b: True if either a or b or both are True. False if both are False.
- not a: True if a is False, False if a is True.
Branching blocks
In Python, we branch our code using if, elif, and else. This is the branching syntax:
if condition1:
body
elif condition2:
body
else:
bodyCommon Mistakes:
An elif statement must follow an if statement, and the body will only be executed if the if statement condition is False. The if body will be executed if condition 1 is True. Only the elif body will be executed if condition 1 is False and condition 2 is True. The else body will be executed when all the other specified conditions are False.
Typical use:
Python if else statements allow you to create branching for your script, this instructs your computer to make decisions based on inputs.