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Python 3: An interactive deep dive

Making Assertions

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Like many programming languages, Python has an assert statement. Here’s how it works.

Python 3.5
assert 1 + 1 == 2                                     #①
assert 1 + 1 == 3                                     #②
#Traceback (most recent call last):
# File "/usercode/__ed_file.py", line 2, in <module>
# assert 1 + 1 == 3 # \u2461
#AssertionError
Python 3.5
assert 2 + 2 == 5, "Only for very large values of 2"  #③
#Traceback (most recent call last):
# File "/usercode/__ed_file.py", line 1, in <module>
#  assert 2 + 2 == 5, "Only for very large values of 2" #\u2462
#AssertionError: Only for very large values of 2

① The assert statement is followed by any valid Python expression. ...