[issue9876] ConfigParser can't interpolate values from other sections

[Alexander Solovyov]

New submission from Alexander Solovyov <piranha at piranha.org.ua>:

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	2010-09-16 19:20:27.000000000 +0300
+++ ConfigParser.py	2010-09-16 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)

----------
components: Library (Lib)
messages: 116573
nosy: asolovyov
priority: normal
severity: normal
status: open
title: ConfigParser can't interpolate values from other sections
type: feature request
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9876>
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