diff --git a/Lib/configparser.py b/Lib/configparser.py
index 42d0ae1c0b52fb..05b86acb919bfd 100644
--- a/Lib/configparser.py
+++ b/Lib/configparser.py
@@ -526,6 +526,8 @@ def _interpolate_some(self, parser, option, accum, rest, section, map,
except (KeyError, NoSectionError, NoOptionError):
raise InterpolationMissingOptionError(
option, section, rawval, ":".join(path)) from None
+ if v is None:
+ continue
if "$" in v:
self._interpolate_some(parser, opt, accum, v, sect,
dict(parser.items(sect, raw=True)),
diff --git a/Lib/test/test_configparser.py b/Lib/test/test_configparser.py
index ab86d7f1af3981..89f9f1247b55ea 100644
--- a/Lib/test/test_configparser.py
+++ b/Lib/test/test_configparser.py
@@ -1328,6 +1328,47 @@ class ConfigParserTestCaseNoValue(ConfigParserTestCase):
allow_no_value = True
+class NoValueAndExtendedInterpolation(CfgParserTestCaseClass):
+ interpolation = configparser.ExtendedInterpolation()
+ allow_no_value = True
+
+ def test_interpolation_with_allow_no_value(self):
+ config = textwrap.dedent("""
+ [dummy]
+ a
+ b = ${a}
+ """)
+ cf = self.fromstring(config)
+
+ self.assertIs(cf["dummy"]["a"], None)
+ self.assertEqual(cf["dummy"]["b"], "")
+
+ def test_explicit_none(self):
+ config = textwrap.dedent("""
+ [dummy]
+ a = None
+ b = ${a}
+ """)
+ cf = self.fromstring(config)
+
+ self.assertEqual(cf["dummy"]["a"], "None")
+ self.assertEqual(cf["dummy"]["b"], "None")
+
+
+class ConfigParserNoValueAndExtendedInterpolationTest(
+ NoValueAndExtendedInterpolation,
+ unittest.TestCase,
+):
+ config_class = configparser.ConfigParser
+
+
+class RawConfigParserNoValueAndExtendedInterpolationTest(
+ NoValueAndExtendedInterpolation,
+ unittest.TestCase,
+):
+ config_class = configparser.RawConfigParser
+
+
class ConfigParserTestCaseTrickyFile(CfgParserTestCaseClass, unittest.TestCase):
config_class = configparser.ConfigParser
delimiters = {'='}
diff --git a/Misc/NEWS.d/next/Library/2025-03-07-17-47-32.gh-issue-130941.7_GvhW.rst b/Misc/NEWS.d/next/Library/2025-03-07-17-47-32.gh-issue-130941.7_GvhW.rst
new file mode 100644
index 00000000000000..4f0cda8d03e902
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-03-07-17-47-32.gh-issue-130941.7_GvhW.rst
@@ -0,0 +1,2 @@
+Fix :class:`configparser.ConfigParser` parsing empty interpolation with
+``allow_no_value`` set to ``True``.
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