Import all classes in directory?

Question

I found this, but that's not quite what I want to do.

I want to import all the classes in all the files in a directory. Basically, I want to replace this:

from A import *
from B import *
from C import *

With something dynamic, so that I don't have keep editing my __init__.py every time I add another file.

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The glob solution seems to be the equivalent of

import A
import B
import C

which is not the same at all.

Answer 1

You can do something like this, although keep in mind isinstance(cls, type) only works with new-style classes.

import os, sys

path = os.path.dirname(os.path.abspath(__file__))

for py in [f[:-3] for f in os.listdir(path) if f.endswith('.py') and f != '__init__.py']:
    mod = __import__('.'.join([__name__, py]), fromlist=[py])
    classes = [getattr(mod, x) for x in dir(mod) if isinstance(getattr(mod, x), type)]
    for cls in classes:
        setattr(sys.modules[__name__], cls.__name__, cls)