如何重新加载 python 子模块？

Question

I'm loading a submodule in python (2.7.10) with from app import sub where sub has a config variable. So I can run print sub.config and see a bunch of config variables. Not super complex.

If I change the config variables in the script, there must be a way to reload the module and see the change. I found a few instructions that indicated that reload(app.sub) would work, but I get an error:

NameError: name 'app' is not defined

And if I do just reload(sub) the error is:

TypeError: reload() argument must be module

If I do import app I can view the config with print app.sub.config and reload with reload(app)

-- if I do import app and then run

I found instructions to automate reloading: Reloading submodules in IPython

but is there no way to reload a submodule manually?

Answer 1

When you from foo import bar , you now have a module object named bar in your namespace, so you can

from foo import bar

bar.do_the_thing()  # or whatever

reload(bar)

If you want some more details on how different import forms work, I personally found this answer particularly helpful, myself.

Answer 2

With python3,I try this:

import importlib
import sys

def m_reload():
    for k,v in sys.modules.items():
        if k.startswith('your-package-name'):
            importlib.reload(v)

Answer 3

from importlib import reload
import sys
ls=[]
#making copy to avoid regeneration of sys.modules
for i,j in sys.modules.items():
    r,v=i,j
    ls.append((r,v))

for i in ls:
    if i[0] == 'my_library_name':
        reload(i[1])