If statement

The if statement is a so-called conditional statement. It is followed by an expression that can evaluate to either True or False. If the expression evaluates to True, the block of code that follows is executed. If it evaluates to False, it is skipped.

Go ahead and change door_is_locked to False to see what happens.

Read more at the tutorial on booleans and conditional programming.

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If statement (Python 3 )