Issue1294

The version is actually 2.5b3 (couldn't find it there).

The code below shows the error. exec() fails with:

TypeError: exec: argument 1 must be string, code or file object

But note that the if the namespace is not passed (globals and locals) it
works. 

I've marked it as critical because this seems like a real blocker
(cannot make a debugger work properly without it, as any expressions
won't work)


import sys
import unittest

class TestCase(unittest.TestCase):

    def testExec(self):
        frame = sys._getframe()
        exec('print self.__class__', {}, frame.f_locals)

if __name__ == '__main__':
    unittest.main()

In this case the exec statement will be called with a tuple with 3 parts
as it's first argument. This emulates the 3.x behavior, the "normal" 2.x
behavior is "exec stmt [in globals [, locals]]".
Apparently exec should be able to accept a tuple as first "argument" in 2.x.

The results I got from Python 2.5 and 3.0 are below (both seem to accept
the form passed -- although one interprets it as a tuple and the other
from a method call, that form should be compatible across any version)

In Python 2.5.1

Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> class Foo(object):
...   def foo(self):
...     exec('print self.__class__', {}, sys._getframe().f_locals)
...
>>> Foo().foo()
<class '__main__.Foo'>
>>>


In Python 3.0

Python 3.0 (r30:67507, Dec  3 2008, 20:14:27) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> class Foo(object):
...   def foo(self):
...     exec('print(self.__class__)', {}, sys._getframe().f_locals)
...
>>> Foo().foo()
<class '__main__.Foo'>
>>>

Fixed in rev #6118.