通过字符串形式导入模块

利用importlib模块

settings.py

class Foo(object):
    DEBUG = True
    TEMPLATES = "templates"

test.py

import importlib

path = "settings.Foo"
k, v = path.rsplit(".", 1)

m = importlib.import_module(k)
print(m)  # <module 'settings' from 'D:\\PycharmProjects\\untitled\\flask_demo\\settings.py'>
print(m.Foo)  # <class 'settings.Foo'>

foo = getattr(m, v)
print(foo, type(foo),
      dir(foo))  # <class 'settings.Foo'> <class 'type'> ['DEBUG', 'TEMPLATES', '__class__', '__delattr__ ...

for i in dir(foo):
    if i.isupper():
        ret = getattr(foo, i)
        print(ret)  # True  templates