Some sort of fmap implementation in Python

map.py

import inspect

def fmap(f, functor):
    def _dict_map(f, functor):
        result = {}
        for key, value in functor.items():
            result[key] = f(value)
        return result

    def _object_map(f, functor):
        map_method = getattr(functor, "map", None)
        if callable(map_method):
            return functor.map(f)
    
        attributes = inspect.getmembers(functor, lambda a:not(inspect.isroutine(a)))
        user_attrs = [a for a in attributes if not(a[0].startswith('__') and a[0].endswith('__'))]
        new_functor = functor.__class__()
        for a in user_attrs:
            setattr(new_functor, a[0], f(a[1]))
        return new_functor

    def _list_map(f, functor):
        idx = 0
        length = len(functor)
        result = []
        while idx < length:
            result.append(f(functor[idx]))
            idx += 1
        return result
        
    if isinstance(functor, list):
        return _list_map(f, functor)

    elif isinstance(functor, dict):
        return _dict_map(f, functor)

    elif isinstance(functor, object):
        return _object_map(f, functor)

    else:
        return map(f, functor)