doctest and pytest
2.7 Type Conversion Functions
2.8 Application: Representing Text
if __name__ == '__main__'
3.7 Function Specification
3.8 Richer Type Annotations
3.9 Working With Definitions
3.10 Testing Functions II: hypothesis
3.11 Working with Multiple Quantifiers
object Superclass
doctest
B.2 pytest
B.3 python-ta
B.4 typing
B.5 pdb