[issue3354] sort(reverse=None) prints misleading error message

[Christoph Zwerschke]

Christoph Zwerschke <cito at online.de> added the comment:

The problem is not only that the error message "TypeError: an integer is
required" has "integer" instead of "boolean", but it does not mention
the attribute name "reverse", i.e. it does not even say *where* the
integer is required. I firmly believe error messages should not only be
technically correct, but also precise, meaningful and helpful for the user.

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<http://bugs.python.org/issue3354>
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