[docs] [issue16011] "in" should be consistent with return value of __contains__

[Eric Lafontaine]

Eric Lafontaine added the comment:

Hi,

For user-defined class, it's up to the class to do the right implementation in my opinion. It's true the description is wrong though. 

x in y means that x exist inside of y (so that the execution of y.__contain__(x) is executed successfully and (I guess) doesn't return None,False or 0).

I'll modify the doc to be :
For user-defined classes which define the __contains__() method, x in y is false if y.__contains__(x) is returning either None,False or 0.  Otherwise, x in y return true.

Regards,
Eric Lafontaine

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nosy: +Eric Lafontaine

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<http://bugs.python.org/issue16011>
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