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Python assert Keyword

❮ Python Keywords


Test if a condition returns True:

x = "hello"

#if condition returns True, then nothing happens:
assert x == "hello"

#if condition returns False, AssertionError is raised:
assert x == "goodbye"
Run example »

Definition and Usage

The assert keyword is used when debugging code.

The assert keyword lets you test if a condition in your code returns True, if not, the program will raise an AssertionError.

You can write a message to be written if the code returns False, check the example below.

More Examples


Write a message if the condition is False:

x = "hello"

#if condition returns False, AssertionError is raised:
assert x == "goodbye", "x should be 'hello'"
Run example »

❮ Python Keywords