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Often it is useful to access some variable in other section for interpolation needs: for example, parent directory declared in common section could be used in configuration of certain components. Included patch can fix that (using syntax 'section.variable'), is there any chances that it could be applied? :)
--- ConfigParser.old.py	2010年09月16日 19:20:27.000000000 +0300
+++ ConfigParser.py	2010年09月16日 19:22:33.000000000 +0300
@@ -585,7 +585,7 @@
 if "%(" in value:
 value = self._KEYCRE.sub(self._interpolation_replace, value)
 try:
- value = value % vars
+ value = value % _Context(self, section)
 except KeyError, e:
 raise InterpolationMissingOptionError(
 option, section, rawval, e.args[0])
@@ -667,3 +667,15 @@
 raise ValueError("invalid interpolation syntax in %r at "
 "position %d" % (value, m.start()))
 ConfigParser.set(self, section, option, value)
+
+
+class _Context(object):
+ def __init__(self, config, section):
+ self.config = config
+ self.section = section
+
+ def __getitem__(self, key):
+ if '.' in key:
+ return self.config.get(*key.split('.'))
+ else:
+ return self.config.get(self.section, key)

Stable versions don’t get new features, only bug fixes.

Hopefully a form of this feature will be introduced as part of #10499. The discussion goes on there.