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

assert True #nothing happened

# assert 4 / 0

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



a = 2
b = 4
assert a + b == 5, "a+b should be 6"

