change to TypeError

Author: lpyu001

Doc/library/configparser.rst

@@ -1206,9 +1206,9 @@ ConfigParser Objects
       ``'1'``, ``'yes'``, ``'true'``, and ``'on'``, which cause this method to
       return ``True``, and ``'0'``, ``'no'``, ``'false'``, and ``'off'``, which
       cause it to return ``False``.  These string values are checked in a
-      case-insensitive manner.  Any other value will cause it to raise
-      :exc:`ValueError`.  See :meth:`get` for explanation of *raw*, *vars* and
-      *fallback*.
+      case-insensitive manner.  Any other string value will cause it to raise
+      :exc:`ValueError`.  If the option has no value, :exc:`TypeError` is
+      raised.  See :meth:`get` for explanation of *raw*, *vars* and *fallback*.
 
 
    .. method:: items(raw=False, vars=None)

Lib/configparser.py

@@ -1222,7 +1222,9 @@ def _unify_values(self, section, vars):
     def _convert_to_boolean(self, value):
         """Return a boolean value translating from other types if necessary.
         """
-        if value is None or value.lower() not in self.BOOLEAN_STATES:
+        if value is None:
+            raise TypeError('Cannot convert a value-less option to a boolean')
+        if value.lower() not in self.BOOLEAN_STATES:
             raise ValueError('Not a boolean: %s' % value)
         return self.BOOLEAN_STATES[value.lower()]
 

Lib/test/test_configparser.py

@@ -1341,9 +1341,9 @@ class ConfigParserTestCaseNoValue(ConfigParserTestCase):
     def test_getboolean_with_no_value(self):
         cf = self.fromstring("[section]\noption\n")
 
-        with self.assertRaisesRegex(ValueError, "Not a boolean: None"):
+        with self.assertRaises(TypeError):
             cf.getboolean("section", "option")
-        with self.assertRaisesRegex(ValueError, "Not a boolean: None"):
+        with self.assertRaises(TypeError):
             cf["section"].getboolean("option")
 
 

Misc/NEWS.d/next/Library/2026-08-09-22-50-19.gh-issue-155436.gyB8_I.rst

@@ -1,3 +1,3 @@
-:class:`configparser.ConfigParser` now raises :exc:`ValueError` instead of
+:class:`configparser.ConfigParser` now raises :exc:`TypeError` instead of
 :exc:`AttributeError` when :meth:`~configparser.ConfigParser.getboolean` is
 called on an option without a value while ``allow_no_value=True``.