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Re: Asymmetry in globals __getitem__/__setitem__

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On Friday, June 13, 2014 8:07:45 AM UTC+2, Marko Rauhamaa wrote:
> 
> The documentation is a bit vague about it:
> 
>    If only globals is provided, it must be a dictionary, which will be
>    used for both the global and the local variables. If globals and
>    locals are given, they are used for the global and local variables,
>    respectively. If provided, locals can be any mapping object.


Interesting.  This paragraph explicitly states "locals can be any mapping object," but that seems to be false:


class Namespace(dict):                                                          
    def __getitem__(self, key):                                                 
        print("getitem", key)                                                   
    def __setitem__(self, key, value):                                          
        print("setitem", key, value)                                            
                                                                                
def fun():                                                                      
    x  # should call locals.__getitem__                                         
    y = 1  # should call locals.__setitem__                                     
                                                                                
exec(fun.__code__, {}, Namespace())


Neither __getitem__ nor __setitem__ seem to be called on the local variables.

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Asymmetry in globals __getitem__/__setitem__ Robert Lehmann <mail@robertlehmann.de> - 2014-06-12 20:18 +0200
  Re: Asymmetry in globals __getitem__/__setitem__ Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-06-13 12:38 +1200
    Re: Asymmetry in globals __getitem__/__setitem__ Marko Rauhamaa <marko@pacujo.net> - 2014-06-13 09:07 +0300
      Re: Asymmetry in globals __getitem__/__setitem__ robert@robertlehmann.de - 2014-06-13 03:13 -0700
        Re: Asymmetry in globals __getitem__/__setitem__ Peter Otten <__peter__@web.de> - 2014-06-13 12:53 +0200
        Re: Asymmetry in globals __getitem__/__setitem__ Paul Sokolovsky <pmiscml@gmail.com> - 2014-06-13 14:28 +0300
          Re: Asymmetry in globals __getitem__/__setitem__ Marko Rauhamaa <marko@pacujo.net> - 2014-06-13 15:32 +0300

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