New submission from Claudiu.Popa:
The error message from the title is not very intuitive from a user point of
view. For instance, in the following traceback, only the first one gives a
meaning to this error, through the leaked KeyError, thus the user knows that
home_dir1 is invalid and missing. But the second message with "Bad value
substitution" doesn't emphasize the actual problem and you have to stare at it
for a couple of moments to figure out what's happening and why. Maybe changing
the "Bad value substitution" with a "Missing value" would suffice. This came up
in issue19546.
Traceback (most recent call last):
File "C:\Python34\lib\configparser.py", line 410, in _interpolate_some
v = map[var]
File "C:\Python34\lib\collections\__init__.py", line 789, in __getitem__
return self.__missing__(key) # support subclasses that define
__missing__
File "C:\Python34\lib\collections\__init__.py", line 781, in __missing__
raise KeyError(key)
KeyError: 'home_dir1'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python34\lib\configparser.py", line 1204, in __getitem__
return self._parser.get(self._name, key)
File "C:\Python34\lib\configparser.py", line 773, in get
d)
File "C:\Python34\lib\configparser.py", line 374, in before_get
self._interpolate_some(parser, option, L, value, section, defaults, 1)
File "C:\Python34\lib\configparser.py", line 413, in _interpolate_some
option, section, rest, var)
configparser.InterpolationMissingOptionError: Bad value substitution:
section: [Paths]
option : my_dir
key : home_dir1
rawval : /lumberjack
----------
components: Library (Lib)
messages: 215589
nosy: Claudiu.Popa
priority: normal
severity: normal
status: open
title: configparser.InterpolationMissingOptionError is not very intuitive
type: behavior
versions: Python 3.5
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21159>
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