>>> x = 3
>>> def foo():
... exec("print(globals(), locals()); x = x + 1; print(globals(),
locals())")
...
>>> foo()
{'foo': <function foo at 0x021C3468>, '__package__': None, '__builtins__':
<module 'builtins' (built-in)>, '__loader__': <class
'_frozen_importlib.BuiltinImporter'>, '__doc__': None, '__name__': '__main__',
'__spec__': None, 'x': 3} {}
{'foo': <function foo at 0x021C3468>, '__package__': None, '__builtins__':
<module 'builtins' (built-in)>, '__loader__': <class
'_frozen_importlib.BuiltinImporter'>, '__doc__': None, '__name__': '__main__',
'__spec__': None, 'x': 3} {'x': 4}
>>> def goo():
... print(globals(), locals())
... x = x + 1
... print(globals(), locals())
...
>>> goo()
{'foo': <function foo at 0x021C3468>, '__package__': None, '__builtins__':
<module 'builtins' (built-in)>, '__loader__': <class
'_frozen_importlib.BuiltinImporter'>, '__doc__': None, '__name__': '__main__',
'__spec__': None, 'goo': <function goo at 0x021C3420>, 'x': 3} {}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 3, in goo
UnboundLocalError: local variable 'x' referenced before assignment
>>>
Can't figure out what makes it different:-(
--Jach
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