New submission from metagriffin:
the ConfigParser classes allow option values with interpolation syntax
violations to be loaded from an INI file, and to be extracted as long as the
`raw` parameter is set to True in the get*() methods. the following code
demonstrates this asymmetry:
``` python
import configparser
import io
buf = io.StringIO('[time]\nfmt = %H:%M:%S\n')
cfg = configparser.SafeConfigParser()
cfg.readfp(buf)
# prove that "%H:%M:%S" is valid in a SafeConfigParser:
assert cfg.get('time', 'fmt', raw=True) == '%H:%M:%S'
# but it cannot be set:
cfg.set('time', 'fmt', '%I:%M %p')
# => raises configparser.InterpolationSyntaxError: '%' must be followed by '%'
or '(', found: '%I:%M %p'
```
the intuitive resolution to this asymmetry is to add a `raw` parameter to
set(), which would allow:
``` python
cfg.set('time', 'fmt', '%I:%M %p', raw=True)
assert cfg.get('time', 'fmt', raw=True) == '%I:%M %p'
```
note that this is a new problem to python 3, which added the following lines to
the ConfigParser.set() method:
``` python
if value:
value = self._interpolation.before_set(self, section, option,
value)
```
----------
components: Library (Lib)
messages: 216554
nosy: metagriffin
priority: normal
severity: normal
status: open
title: ConfigParser allows "get(*, raw=True), but no corresponding "set(*,
raw=True)"
type: enhancement
versions: Python 3.1, Python 3.2, Python 3.3, Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue21265>
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