Eric V. Smith <e...@trueblade.com> added the comment:

Note also that the nested expansion is only allowed in the format_spec part, 
per the documentation. Your last examples are attempting to do it in the 
field_name, which leads to the errors you see. Your very last example doesn't 
look right to me. I'll have to investigate why it's giving you that error 
message.

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<http://bugs.python.org/issue12014>
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