Eric V. Smith <e...@trueblade.com> added the comment:
The format specifier (here, 'x') always goes last.
>>> '{0:_x}'.format(123456789)
'75b_cd15'
See https://docs.python.org/3/library/string.html#formatstrings for the details.
Serhiy is correct that it's often easier to use format() instead of ''.format()
for testing things like this.
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nosy: +eric.smith
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<https://bugs.python.org/issue33013>
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