[Python-Dev] Advice in stat.py
Thomas Wouters
thomas@xs4all.net
Sun, 29 Jul 2001 17:33:43 +0200
On Sat, Jul 28, 2001 at 09:54:21AM -0400, Guido van Rossum wrote:
> > Worse, according to the Reference Manual,
> > The "from" form with "*" may only occur in a module scope.
> I don't know when that snuck in, but it's not enforced. If we're
> serious, we should at least add a warning!
Eh, last I looked, you and Jeremy were most serious about this :) It came up
during the nested-scopes change in 2.1, where it was first made illegal, and
later just illegal in the presence of a nested scope:
(without future statement)
>>> def spam(x):
... from stat import *
... def eggs():
... print x
...
<stdin>:1: SyntaxWarning: local name 'x' in 'spam' shadows use of 'x' as
global in nested scope 'eggs'
<stdin>:1: SyntaxWarning: import * is not allowed in function 'spam' because
it contains a nested function with free variables
(with future statement)
>>> def spam(x):
... from stat import *
... def eggs():
... print x
...
File "<stdin>", line 2
SyntaxError: import * is not allowed in function 'spam' because it contains
a nested function with free variables
> I'll add a bug report.
Should we warn about exec (without 'in' clause) in functions as well ?
(without future statement)
>>> def spam(x,y):
... exec y
... def eggs():
... print x
...
<stdin>:1: SyntaxWarning: local name 'x' in 'spam' shadows use of 'x' as
global in nested scope 'eggs'
<stdin>:1: SyntaxWarning: unqualified exec is not allowed in function 'spam'
it contains a nested function with free variables
(with future statement)
>>> def spam(x,y):
... exec y
... def eggs():
... print x
...
File "<stdin>", line 2
SyntaxError: unqualified exec is not allowed in function 'spam' it contains
a nested function with free variables
The warnings *only* occur in the presence of a nested scope, though.
--
Thomas Wouters <thomas@xs4all.net>
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