问题
I'm trying to write my first Python package, and almost all my modules will need to use NumPy. Should I write import numpy in every single module or is there some place in the package I can just import it once so every module can use it? What's the best way to do this?
回答1:
Yes, just import it everywhere it's needed.
Don't get too clever with writing functions that import everything for you or metamodules that import things and from which you import *; all of that only serves to make your code hard to read and is just another place for bugs to happen.
来源：https://stackoverflow.com/questions/15259639/create-python-package-and-import-modules