New submission from Trevor Bekolay:
I was having an issue installing a package in Python 3, which installed
properly in Python 2. This is the error message I got:
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
... snip unhelpful traceback ...
File
/usr/local/Cellar/python3/3.4.3/Frameworks/Python.framework/Versions/3.4/lib/python3.4/configparser.py,
line 423, in _interpolate_some
found: %r % (rest,))
configparser.Interpolation
Command python setup.py egg_info failed with error code 1 in
/private/var/folders/12/p4ngkfbx2pnb1ln81csjb19cgn/T/pip-build-6xhgg5x6/nengo
This wasn't a super helpful error message. I managed to figure out that Python
3 (or setuptools?) was attempting to parse my ~/.pypirc file, which raised a
configparser.InterpolationSyntaxError because my password contained a
percent-sign. Configparser doesn't try to interpolate this string in Python 2,
so it worked fine. As a workaround, I've changed my PyPI password, but this
failure was quite surprising to me.
As for what I would expect to happen, I would not expect interpolation to
happen if I don't want it to happen. All of the examples shown on in the docs
use the syntax %(key)s or ${key}. If this is the only way to interpolate,
then why is % ambiguous? Surely we can look forward one character, and if
it's not ( then % should be interpreted literally. Instead, configparser
requires me to disambiguate with %%. But, this would cause my string to be
parsed incorrectly in Python 2's configparser, so I'm unable to make that
change.
--
components: Library (Lib)
messages: 242283
nosy: tbekolay
priority: normal
severity: normal
status: open
title: Configparser interpolation is unexpected
type: behavior
versions: Python 3.2, Python 3.3, Python 3.4
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http://bugs.python.org/issue24086
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