(binding) in python

binding.py

from contextlib import contextmanager

@contextmanager
def binding(**pairs):
    g = globals()
    prev = dict((k, g[k]) for k in pairs.iterkeys() if k in g)
    g.update(pairs)
    try:
        yield
    finally:
        g.update(prev)

""" ex:

>>> foo = False
>>> foo
False
>>> with binding(foo = True):
    foo
True
>>> foo
False