>>> version_info
(3, 0, 1, 'final', 0)
# I know this is an older version---stuck with it at work.
# I did not see this issue in the tracker (380 results for nan).
# Perhaps there is better documentation for how to use the issue
# tracker. Many of the links on the Dealing with Bugs page---
# https://docs.python.org/3/bugs.html#contributing-to-python
# ---are not helpful, e.g., 'contribute' just links back the same
# page.
#
# There are similar problems with inf and -inf
>>> isnan(float('nan'))
True
>>> repr(float('nan'))
'nan'
>>> '{0:f}'.format(float('nan'))
'-1.#IND00'
>>> '{0:F}'.format(float('nan'))
'-1.#IND00'
>>> '{0:g}'.format(float('nan'))
'-1.#IND'
>>> '{0:G}'.format(float('nan'))
'-1.#IND'
>>> '{0:.2f}'.format(float('nan'))
'-1.#J'

# c.f. https://docs.python.org/3/library/string.html#formatspec

I think you need to clarify with whoever is restricting your Python version which version you can actually use: Python 3.0.1 has been out of support for the better part of 10 years now and hardly anybody ever actually used that particular version (aside from me :))

I have confirmed that Python 3.6 (the oldest version which would receive a fix for this at this point) behaves as expected:

In [1]: '{0:f}'.format(float('nan'))
Out[1]: 'nan'

In [2]: '{0:F}'.format(float('nan'))
Out[2]: 'NAN'

In [3]: '{0:g}'.format(float('nan'))
Out[3]: 'nan'

In [4]: '{0:G}'.format(float('nan'))
Out[4]: 'NAN'

In [5]: '{0:.2f}'.format(float('nan'))
Out[5]: 'nan'

Thank you so much for that reply. Maybe with that I can push for an upgrade.

nosy: + zach.ware
messages: + msg311394

resolution: out of date
stage: resolved