Get attributes from nested objects

rgetattr.py

from functools import reduce


def rgetattr(obj, attr, *args):
    """See https://stackoverflow.com/questions/31174295/getattr-and-setattr-on-nested-objects"""
    def _getattr(obj, attr):
        return getattr(obj, attr, *args)
    return reduce(_getattr, [obj] + attr.split('.'))

import os.path
print(rgetattr(os, 'path.sep'))
print(rgetattr(os, 'path.sepx', None))
print(rgetattr(os, 'path.sepx', '--'))
print(rgetattr(os, 'path.sepx'))  # will raise AttributeError