[ python-Feature Requests-1483384 ] Add set.member() method

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Feature Requests item #1483384, was opened at 2006-05-07 10:41
Message generated for change (Comment added) made by rhettinger
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Category: Extension Modules
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Michael Tsai (michaeltsai)
Assigned to: Raymond Hettinger (rhettinger)
Summary: Add set.member() method

Initial Comment:
Right now, when I check membership in a set, the __in__ method just 
returns True/False if there is an object in the set that's == to the 
argument. I would like to have a member() method that returns the object 
in the set or raises KeyError if the argument is not in the set. This would 
be useful for interning and other cases where right now I'd use a 
degenerate dictionary where the keys and values are equal.

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>Comment By: Raymond Hettinger (rhettinger)
Date: 2006-05-08 00:37

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I'm curious to see some of your dictionary examples that 
do not seem to tranlate cleanly with the existing set API.

In published code, I've not seen people writing anything 
like what is being requested, i.e. I haven't seen 
fragments like:
   if x in s:
      return x
   else:
      raise KeyError



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Comment By: Georg Brandl (gbrandl)
Date: 2006-05-07 15:36

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Moving to Feature Requests. Note that I do not think Raymond
will agree to this.

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