Terry J. Reedy <[email protected]> added the comment:
Issues like this, about exec, have come up multiple times. I just closed #14049
as a duplicate of this, and listed there some other issues. So I think that the
doc for exec (and execfile in 2.7) could be better still. I would like to see
something like the following added, whether instead of or in addition to the
current proposal -- perhaps after "If provided, locals can be any mapping
object." (quote from the 3.2 exec entry)
"At module level, globals and locals are the same dictionary. If one passes two
separate objects as globals and locals, the code will be executed as if it were
embedded in a class definition."
To me, this is friendlier and less intimidating than 'free variable' and the
Execution model doc chapter. It summarizes the essential problem with such exec
calls.
To illustrate, the following gives the same NameError. and for the same reason,
as exec(code,{},{}), where code is the quoted unindented version with the class
line deleted.
class x:
x = 1
def incx():
return x+1
print(incx())
----------
nosy: +terry.reedy
versions: +Python 2.7, Python 3.2
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