Eric V. Smith added the comment:
Or:
"{:{:s}{:d}s}".format(str(self.pcs), self.format_align, self.max_length)
You're trying to apply the string format specifier (the stuff after the first
colon through the final "s", as expanded) to an object that's not always a
string: sometimes it's None. So you need to use one of the two supported ways
to convert it to a string. Either str() or !s.
str.format() is very much dependent on the types of its arguments: the format
specifier needs to be understood by the object being formatted. Similarly, you
couldn't pass in a datetime and expect that to work, either.
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<http://bugs.python.org/issue7994>
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