closures - Reflect / Inspect closed-over variables in Python

Question

If I have:

def f(x):
  def g(y):
    return x + y
  return g

f2 = f(2)

Is there a way to find the x binding that f2 will use? I looked at inspect but could not tell if some of the frame stuff would apply. In other words, could I define a closed_vars() below:

def closed_vars(anF):
    ... return ...

assert closedVars(f2) == {'x': 2}

Answer 1

You don't have to use the inspect module here.

>>> dict(zip(f2.func_code.co_freevars, (c.cell_contents for c in f2.func_closure)))
{'x': 2}

works in Python 2.7