[issue1766304] improve xrange.__contains__

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

[Joseph Thomson]
> Also, as I said in my closed duplicate issue, 'if value in range(lower,
> upper)' to me looks far more Pythonic than 'if value >= lower and value
> < upper'.

Note that the Pythonic spelling would be:  'if lower <= value < upper'.
 (Though that's not quite the same thing if value is not an integer.)

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<http://bugs.python.org/issue1766304>
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