# main.py
from submodule import some
from easyconf import parse_args

if __name__ == '__main__':
    print(some())

# submodule.py
import conf

def some():
    return 'a' + conf.conf['somekey']

# pth file
import easyconf
import sys; sys.meta_path.append(easyconf.CustomImporter())

import sys

class CustomImporter:
    name = 'conf'

    def find_module(self, fullname, path):
        return self if fullname == self.name else None

    def load_module(self, fullname):
        module = sys.modules.get(fullname)
        if module:
            return module
        if fullname != self.name:
            raise ImportError(fullname)
        sys.modules[fullname] = ConfigModule(None)
        return sys.modules[fullname]

class ConfigModule:
    def __init__(self, conf=None):
        self.conf = conf