To invoke a specific edition of Python, type py followed by the switch in the left-hand column for the appropriate version. For instance, to launch the 64-bit edition of Python 3.9, you would type ...

Type-checking systems for Python are mainly for the sake of ensuring a program’s correctness at runtime, not for speeding up Python applications. However, a few projects do exist that try to ...

This is important, so I'll repeat and stress it: type annotations are ignored by the Python language, although it does store them in an attribute called __annotations__. For example, after defining ...