pep 8 constants

[Steve Holden]

Ethan Furman wrote:
> Steve Holden wrote:
>> Brian Allen Vanderburg II wrote:
>>
>>> bockman at virgilio.it wrote:
>>>
>>>> Constants would be a nice addition in python, sure enough.
>>>> But I'm not sure that this can be done without a run-time check every
>>>> time
>>>> the constant is used, and python is already slow enough. Maybe a check
>>>> that is disabled when running with optimizing flags ?
>>>>
>>>> But I'm sure this discussion has been already made and the FINAL
>>>> WORD has
>>>> been already spoken.
>>>>
>>>> Ciao
>>>> ----
>>>> FB
>>>
>>> One idea to make constants possible would be to extend properties to be
>>> able to exist at the module level as well as the class level:
>>>
>>> @property
>>> def pi():
>>>   return 3.14159.....
>>>
>>> print(pi) # prints 3.14159....
>>> pi=32 # Raise an error Cannot set attribute ...
>>>
>>
>> I don't understand why this would print 3.14159 ... instead of <function
>> __math__.pi>, or whatever.
>>
>> property would clearly have to do something very different in module
>> scope in order to make this work.
>>
>> regards
>>  Steve
> 
> --> class tester(object):
> ...   @property
> ...   def pi(self):
> ...     return 3.141596
> ...
> --> testee = tester()
> --> testee.pi
> 3.1415959999999998
> 
> Looks like that's how property works, so the same behavior on a module
> level would do as Brian suggests.

But that's at the class level, not the module level.

regards
 Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
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