Alexander Belopolsky <belopol...@users.sourceforge.net> added the comment:
I would also like to note the following curiosity:
>>> calendar.isleap("%d")
False
I still don't think there is anything worth fixing here, but we can consider
replacing year % 4 == 0 predicate with year & 3 == 0 which will change the
error raised by isleap("2004") from
TypeError: not all arguments converted during string formatting
to
TypeError: unsupported operand type(s) for &: 'str' and 'int'
I am not sure if the later is much clearer than the former once you consider
obfuscated year & 3 == 0 showing up in the backtrace compared to a clear year %
4 == 0 test.
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<http://bugs.python.org/issue10073>
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