Eric V. Smith added the comment:
> '''
> When no explicit alignment is given, preceding the width field by a zero
> ('0') character enables sign-aware zero-padding for numeric types. This is
> equivalent to a fill character of '0' with an alignment type of '='.
> '''
I think that's good.
> I presume the problem with changing the error message is that it is not
> immediately known that alignment was set implicitly, by 0 before decimal
> width, rather than explicitly. If the spec string is still available, it
> could be searched and the message adjusted if '=' is not present. That
> proposal should be a new issue if someone wants to push it.
Yes, that's the problem. I guess it would be easier to keep track of
which fields were set via defaults, and which explicitly. Currently,
that information is lost.
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<http://bugs.python.org/issue15660>
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