dynamic variables; globals

[Randy Heiland]

I want to do something like the following:

>>> def func(sarg):
...   exec(sarg)
...
>>> func('foo=11')
>>> func('print foo')

but of course, I get the following:

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<stdin>", line 2, in func
  File "<string>", line 1, in ?
NameError: name 'foo' is not defined

Style & security notwithstanding, is there some way to add a dynamic
variable to the globals list?

thanks,
Randy