ConfigParser can't interpolate values from other sections

@freddrake

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.}

Show more details

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']

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)

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

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

Navigation Menu

Repository navigation

ConfigParser can't interpolate values from other sections #54085

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

ConfigParser can't interpolate values from other sections #54085

Description

Activity

asolovyov commented on Sep 16, 2010

merwok commented on Sep 16, 2010

ambv commented on Nov 22, 2010

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions