cptnwillard wrote:
> Hello all,
> For some reason, the following does not work :
>
>
> class C:
> TYPES = [None]
> DICT = {}
> for Type in TYPES:
> DICT.update((E,Type) for E in [1])
>
>>>> NameError: global name 'Type' is not defined
>
>
> What do you think? Is this a bug?
Here is a simpler example:
>>> class A:
... a = 42
... list(a for _ in "a")
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 3, in A
File "<stdin>", line 3, in <genexpr>
NameError: global name 'a' is not defined
The equivalent code using a list comprehension instead of the generator
expression works without complaint:
>>> class A:
... a = 42
... [a for _ in "a"]
...
>>>
So it seems that Python gets puzzled by the extra scope introduced by the
genexp, i. e. you are seeing an obscure variant of the following
(expected) behaviour:
>>> class B:
... a = 42
... def f(): a
... f()
...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 4, in B
File "<stdin>", line 3, in f
NameError: global name 'a' is not defined
I think you should file a bug report, though making the genexp recognizing
the class scope probably isn't worth the effort.
Peter
--
http://mail.python.org/mailman/listinfo/python-list
