python-notes/assert_tutorial.py at master · twtrubiks/python-notes · GitHub

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def ex1():

    x = "hello"

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

    # raise AssertionError
    assert x == "world"

def ex2():

    x = "hello"
    assert x == "world", "x should be 'hello'"

if __name__ == "__main__":
    ex1()
    # ex2()