Python is great because it includes an interactive mode for learning the language and quickly testing out code ideas. IPython ...

For some time now, Python developers have been able to “annotate” names with type information. With Python 3.5, type hints officially became part of the language (see PEP 484).

The breakpoint() function, new as of Python 3.7, lets you insert a breakpoint into code manually — for instance, in a code path that is triggered only by certain conditions.