How to Debug Python built-in module efficiently?

Question

recently I'm learning Python standard library and reading the source code

help for understanding I copy code segment and paste to python interpreter

but I feel it's inefficient and unwise ('cause import module won't got the _)

I wanna to find a efficient way to test a module, include the _var and _func()

thanks for any good idea -- a green man

Answer 1

The module pdb is an interactive source code debugger for Python programs.

import pdb
pdb.set_trace() #  insert this line at the location you want to break

Documentation is provided here : pdb