Python reload module method

To prevent the problem of two modules importing each other, Python only imports all modules once by default. If you need to re-import the module,

Python2.7 can use reload() directly, and Python3 can use the following methods:

method One: Basic method

from imp import reload
reload(module)

Method two: According to the routine, it can be like this

import imp
imp.reload(module)

Method three: Look at imp.py, and there is a discovery, so it can still be like this

import importlib
importlib.reload(module)

Method four: According to the laws of nature, of course it can also be like this

from importlib import reload
reload(module)