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[3.13] gh-127096: Do not recreate unnamed section on every read in ConfigParser (GH-127228) #129593

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Merged
merged 1 commit into from
Feb 2, 2025
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[3.13] gh-127096: Do not recreate unnamed section on every read in ConfigParser (GH-127228) #129593

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12 changes: 4 additions & 8 deletions Lib/configparser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1093,11 +1093,7 @@ def _handle_continuation_line(self, st, line, fpname):
def _handle_rest(self, st, line, fpname):
# a section header or option header?
if self._allow_unnamed_section and st.cursect is None:
st.sectname = UNNAMED_SECTION
st.cursect = self._dict()
self._sections[st.sectname] = st.cursect
self._proxies[st.sectname] = SectionProxy(self, st.sectname)
st.elements_added.add(st.sectname)
self._handle_header(st, UNNAMED_SECTION, fpname)

st.indent_level = st.cur_indent_level
# is it a section header?
Expand All @@ -1106,10 +1102,10 @@ def _handle_rest(self, st, line, fpname):
if not mo and st.cursect is None:
raise MissingSectionHeaderError(fpname, st.lineno, line)

self._handle_header(st, mo, fpname) if mo else self._handle_option(st, line, fpname)
self._handle_header(st, mo.group('header'), fpname) if mo else self._handle_option(st, line, fpname)

def _handle_header(self, st, mo, fpname):
st.sectname = mo.group('header')
def _handle_header(self, st, sectname, fpname):
st.sectname = sectname
if st.sectname in self._sections:
if self._strict and st.sectname in st.elements_added:
raise DuplicateSectionError(st.sectname, fpname,
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9 changes: 9 additions & 0 deletions Lib/test/test_configparser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2161,6 +2161,15 @@ def test_no_section(self):
self.assertEqual('1', cfg2[configparser.UNNAMED_SECTION]['a'])
self.assertEqual('2', cfg2[configparser.UNNAMED_SECTION]['b'])

def test_multiple_configs(self):
cfg = configparser.ConfigParser(allow_unnamed_section=True)
cfg.read_string('a = 1')
cfg.read_string('b = 2')

self.assertEqual([configparser.UNNAMED_SECTION], cfg.sections())
self.assertEqual('1', cfg[configparser.UNNAMED_SECTION]['a'])
self.assertEqual('2', cfg[configparser.UNNAMED_SECTION]['b'])


class MiscTestCase(unittest.TestCase):
def test__all__(self):
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2024-11-24-22-06-42.gh-issue-127096.R7LLpQ.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Do not recreate unnamed section on every read in
:class:`configparser.ConfigParser`. Patch by Andrey Efremov.
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