New submission from D. Michael Parrish :
>>> 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
--
assignee: docs@python
components: Documentation
messages: 311393
nosy: ana, docs@python
priority: normal
severity: normal
status: open
title: str.format not producing strings for nan argument in accordance with
documentation
type: behavior
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Python tracker
<https://bugs.python.org/issue32737>
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