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ConfigParser can't interpolate values from other sections #54085

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asolovyov mannequin opened this issue Sep 16, 2010 · 3 comments
Closed

ConfigParser can't interpolate values from other sections #54085

asolovyov mannequin opened this issue Sep 16, 2010 · 3 comments
Labels
stdlib Python modules in the Lib dir type-feature A feature request or enhancement

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@asolovyov
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asolovyov mannequin commented Sep 16, 2010

BPO 9876
Nosy @freddrake, @merwok, @ambv
Superseder
  • bpo-10499: Modular interpolation in configparser
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = <Date 2010-11-22.03:20:05.036>
created_at = <Date 2010-09-16.16:38:04.774>
labels = ['type-feature', 'library']
title = "ConfigParser can't interpolate values from other sections"
updated_at = <Date 2010-11-22.03:20:05.034>
user = 'https://bugs.python.org/asolovyov'

    bugs.python.org fields:

    activity = <Date 2010-11-22.03:20:05.034>
actor = 'lukasz.langa'
assignee = 'none'
closed = True
closed_date = <Date 2010-11-22.03:20:05.036>
closer = 'lukasz.langa'
components = ['Library (Lib)']
creation = <Date 2010-09-16.16:38:04.774>
creator = 'asolovyov'
dependencies = []
files = []
hgrepos = []
issue_num = 9876
keywords = []
message_count = 3.0
messages = ['116573', '116609', '122080']
nosy_count = 4.0
nosy_names = ['fdrake', 'eric.araujo', 'lukasz.langa', 'asolovyov']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '10499'
type = 'enhancement'
url = 'https://bugs.python.org/issue9876'
versions = ['Python 3.2']
    @asolovyov
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    asolovyov mannequin commented Sep 16, 2010

    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)

    @asolovyov asolovyov mannequin added stdlib Python modules in the Lib dir type-feature A feature request or enhancement labels Sep 16, 2010
    @merwok
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    merwok commented Sep 16, 2010

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

    @ambv
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    ambv commented Nov 22, 2010

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

    @ambv ambv closed this as completed Nov 22, 2010
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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