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gh-149173: Fix inverted PYTHON_BASIC_REPL environment check in _pyrepl_available() by tanloong · Pull Request #149174 · python/cpython · GitHub

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gh-149173: Fix inverted PYTHON_BASIC_REPL environment check in _pyrepl_available() #149174

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Merged
gaogaotiantian merged 5 commits into from
May 1, 2026
Conversation 1 Commits 5 Checks 49 Files changed
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gh-149173: Fix inverted PYTHON_BASIC_REPL environment check in _pyrepl_available() #149174

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f98ee98
Fix inverted PYTHON_BASIC_REPL environment check in _pyrepl_available()
tanloong Apr 30, 2026
eba912e
blurb
tanloong Apr 30, 2026
3a56ed5
fix sphinx-lint error
tanloong Apr 30, 2026
f6efdf6
fix py:func reference target not found
tanloong Apr 30, 2026
b25ddf5
add test
tanloong Apr 30, 2026
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2 changes: 1 addition & 1 deletion Lib/pdb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -376,7 +376,7 @@ def get_default_backend():

def _pyrepl_available():
"""return whether pdb should use _pyrepl for input"""
if not os.getenv("PYTHON_BASIC_REPL"):
if os.getenv("PYTHON_BASIC_REPL"):
CAN_USE_PYREPL = False
else:
try:
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10 changes: 10 additions & 0 deletions Lib/test/test_pdb.py
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Expand Up @@ -4753,6 +4753,16 @@ def foo(self):
stdout, stderr = self.run_pdb_script(script, commands)
self.assertIn("The specified object 'C.foo' is not a function", stdout)

def test_pyrepl_available(self):
with patch.dict(os.environ, {"PYTHON_BASIC_REPL": "1"}):
self.assertFalse(pdb._pyrepl_available())

with patch.dict(os.environ, {}, clear=True):
mod = types.ModuleType("_pyrepl.main")
mod.CAN_USE_PYREPL = True
with patch.dict("sys.modules", {"_pyrepl.main": mod}):
self.assertTrue(pdb._pyrepl_available())


class ChecklineTests(unittest.TestCase):
def setUp(self):
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2026-04-30-14-21-26.gh-issue-149173.KJqZm0.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix inverted :envvar:`PYTHON_BASIC_REPL` environment check in
``pdb._pyrepl_available``.
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