import os
from contextlib import contextmanager
def traverse_parents(path, include_current=False):
if not include_current:
path = os.path.dirname(path)
previous = None
while previous != path:
yield path
previous = path
path = os.path.dirname(path)
@contextmanager
def monkeypatch(obj, attribute_name, new_value):
"""
Like pytest's monkeypatch, but as a context manager.
"""
old_value = getattr(obj, attribute_name)
try:
setattr(obj, attribute_name, new_value)
yield
finally:
setattr(obj, attribute_name, old_value)