co_freevars question

[Robert Brewer]

Playing around with func_code objects today, I typed:

>>> y = 3
>>> f = lambda x: x.Date == y
>>> f.func_code.co_freevars
()

I would have expected co_freevars to be ('y', ) rather like:

>>> [k for k in f.func_globals if k in f.func_code.co_names and k not in
f.func_code.co_varnames]
['y']

What am I misunderstanding? Under what circumstances does co_freevars
actually possess any items?


Robert Brewer
MIS
Amor Ministries
fumanchu at amor.org