eval, exec and execfile dilemma
ethan at stoneleaf.us
Sat Jul 30 23:22:36 CEST 2011
Chris Angelico wrote:
> On Sat, Jul 30, 2011 at 8:48 PM, Laszlo Nagy <gandalf at shopzeus.com> wrote:
>> the exec statement can be used to execute a def statement. However, I see no
>> way to change the globals, so I cannot use the exec statement.
> A quick test in Python 2.4.5:
>>>> exec "def foo():\n\tbar+=1\n\treturn 1\n"
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "<string>", line 2, in foo
> UnboundLocalError: local variable 'bar' referenced before assignment
This works, though (at least it does on 2.7):
--> exec "def foo():\n\tglobal bar\n\tbar+=1\n\treturn 1\n"
--> bar = 9
Laszlo, why do you think you can't use exec?
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