assert python examples

Example 1: python assert

"""Quick note!
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"""
"""assert:
evaluates an expression and raises AssertionError
if expression returns False
"""
assert 1 == 1  # does not raise an error
assert False  # raises AssertionError
# gives an error with a message as provided in the second argument
assert 1 + 1 == 3, "1 + 1 does not equal 3"
"""When line 7 is run:
AssertionError: 1 + 1 does not equal 3
"""

Example 2: assert keyword in python

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.

x = "hello"

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