Ethan Furman a écrit :
Steve Holden wrote:
Brian Allen Vanderburg II wrote:
(snip)
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.
--> 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.
s/module/instance/
At runtime, modules are instances of the module type - so 'module-level'
names are really instance attributes of the module instance -, and the
descriptor protocol is only invoked for class attributes.
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