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Tue Jun 3 23:38:00 CEST 2014 · https://mail.python.org/pipermail/python-dev/2014-June/134711.html

I'm helping out with the micropython project and am finding that one
of their tests fails on CPython 3.5 (fresh build from Mercurial this
morning). It comes down to this:

Python 3.4.1rc1 (default, May  5 2014, 14:28:34)
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> "%x"%16.0
'10'

Python 3.5.0a0 (default:88814d1f8c32, Jun  4 2014, 07:29:32)
[GCC 4.7.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> "%x"%16.0
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: %x format: an integer is required, not float

Is this an intentional change? And if so, is it formally documented
somewhere? I don't recall seeing anything about it, but my
recollection doesn't mean much.

ChrisA

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[Python-Dev] %x formatting of floats