The binding operator, and what gets bound to what
Steven D'Aprano
steve+comp.lang.python at pearwood.info
Fri Dec 5 07:34:04 EST 2014
Ned Batchelder wrote:
> On 12/5/14 4:53 AM, Steven D'Aprano wrote:
>> Oh, I learned something new: strictly speaking, this is implementation-
>> dependent and not guaranteed to work in the future!
>>
>> def func():
>> global math
>> import math
>
> I don't think this is implementation-dependent.
The docs say that it is:
https://docs.python.org/3/reference/simple_stmts.html#the-global-statement
Names listed in a global statement MUST NOT [emphasis added] be
defined as formal parameters or in a for loop control target,
class definition, function definition, or import statement.
CPython implementation detail: The current implementation does not
enforce the two restrictions, but programs should not abuse this
freedom, as future implementations may enforce them or silently
change the meaning of the program.
--
Steven
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