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I'm trying to 'exec'ing the following code:
class Foo: pass
class Bar:
 f = Foo
 
The error appears when using 'exec f in {}, {}':
>>> f = ''.join(open('/home/stefan/t.py').readlines())
>>> exec f in {}, {}
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
 File "<string>", line 2, in ?
 File "<string>", line 3, in Bar
NameError: name 'Foo' is not defined
I tested on python 2.3 and python 2.4, both show the same
behavior.

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I can confirm this... it appears that things which are set
in the global scope within an "exec ... in {}, {}" are not
then correctly accessed in the global scope when being read.
The following two examples illustrate the problem:
>>> exec """\
... x = 3
... def f():
... global x
... print x
... f()
... """ in {}, {}
3
... and again without the global definition:
>>> exec """\
... x = 3
... def f():
... print x
... f()
... """ in {}, {}
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
 File "<string>", line 4, in ?
 File "<string>", line 3, in f
NameError: global name 'x' is not defined

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user_id=593130
I got a similar NameError in 2.2.1, so this is not due to a recent 
change.

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user_id=849994
This seems like a duplicate of #991196.