https://github.com/python/cpython/commit/8066db57535161dda316a70c1b00a89581bf3399
commit: 8066db57535161dda316a70c1b00a89581bf3399
branch: main
author: Tan Long <[email protected]>
committer: gaogaotiantian <[email protected]>
date: 2026-04-30T22:32:57-07:00
summary:
gh-149173: Fix inverted PYTHON_BASIC_REPL environment check in
_pyrepl_available() (#149174)
files:
A Misc/NEWS.d/next/Library/2026-04-30-14-21-26.gh-issue-149173.KJqZm0.rst
M Lib/pdb.py
M Lib/test/test_pdb.py
diff --git a/Lib/pdb.py b/Lib/pdb.py
index c4bc0020646b0d..4dd974b375c259 100644
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -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:
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index c5171f3388c965..db90019975521e 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -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):
diff --git
a/Misc/NEWS.d/next/Library/2026-04-30-14-21-26.gh-issue-149173.KJqZm0.rst
b/Misc/NEWS.d/next/Library/2026-04-30-14-21-26.gh-issue-149173.KJqZm0.rst
new file mode 100644
index 00000000000000..019ab76b863577
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-04-30-14-21-26.gh-issue-149173.KJqZm0.rst
@@ -0,0 +1,2 @@
+Fix inverted :envvar:`PYTHON_BASIC_REPL` environment check in
+``pdb._pyrepl_available``.
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