setuptools.dist.Distribition.__init__ formatting failure

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Originally reported by: ronaldoussoren (Bitbucket: ronaldoussoren, GitHub: ronaldoussoren)

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The init method of setuptools.dist.Distribution contains a call to warnings.warn at the end of the method. The argument to this call is a formatted using te % operator where the RHS of the call is a user provided value.

When the version argument of the distribution is a tuple this will cause a TypeError, e.g.:

#!python

   Distribution(name='test', version=(1,0))

That call specifies an invalid value for 'version', but that's no reason to crash in this way.

I have no opinion on the correct behavior, obvious options are to create an explicit tuple for the RHS, or to raise an exception for invalid input (for example DistutilsOptionError).

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/379

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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I recommend changing the old formatting to new formatting, which will also solve this issue.