lazy_module_variable.py

normal_variable = "hello I'm a normal variable"


def lazy_variable():
    from random import randint
    return "hello I'm a lazy variable and my favorite number is {}".format(randint(0, 1000))


import sys


class ModuleWrapper(object):

    def __init__(self, wrapped):
        self.wrapped = wrapped

    def __getattr__(self, name):
        attr = getattr(self.wrapped, name)
        if callable(attr):
            return attr()
        else:
            return attr

sys.modules[__name__] = ModuleWrapper(sys.modules[__name__])


if __name__ == '__main__':
    import lazy_module
    print(lazy_module.normal_variable)
    print(lazy_module.lazy_variable)
    print(lazy_module.lazy_variable)