utils.py 文件源码

def get_class_that_defined_method(meth):
    """Returns the class that created the given method.

    A helper function for finding class methods amongst a list of many
    methods. 

    Source:
        http://stackoverflow.com/questions/3589311/get-defining-class-of-unbound-method-object-in-python-3/25959545#25959545
    """
    if inspect.ismethod(meth):
        for cls in inspect.getmro(meth.__self__.__class__):
           if cls.__dict__.get(meth.__name__) is meth:
                return cls
        meth = meth.__func__ # fallback to __qualname__ parsing
    if inspect.isfunction(meth):

        # Check to make sure the method has a "qualname"
        if not getattr(meth, '__qualname__', None):
            return None

        cls = getattr(inspect.getmodule(meth),
                      meth.__qualname__.split('.<locals>', 1)[0].rsplit('.', 1)[0])
        if isinstance(cls, type):
            return cls
    return None # not required since None would have been implicitly returned anyway