[issue40641] Reserved word pair used in lambda tutorial without being noted as a reserved word

[Mark Dickinson]

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

`pair` isn't a reserved word here; it's just the formal parameter name. Think of the lambda here as being equivalent to a function

    def second(pair):
        return pair[1]

You can replace the word "pair" here with any other valid Python identifier, and it'll still work the same way.

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nosy: +mark.dickinson

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<https://bugs.python.org/issue40641>
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