gh-121359: make clean environment (not PYTHON* vars) for test_pyrepl.py

Author: skirpichev

Lib/test/test_pyrepl/test_pyrepl.py

@@ -31,6 +31,14 @@
 except ImportError:
     pty = None
 
+
+clean_env = os.environ.copy()
+# cleanup from PYTHON* variables
+for k in clean_env.copy():
+    if k.startswith("PYTHON"):
+        clean_env.pop(k)
+
+
 class TestCursorPosition(TestCase):
     def prepare_reader(self, events):
         console = FakeConsole(events)
@@ -869,7 +877,7 @@ def test_exposed_globals_in_repl(self):
         self.assertTrue(case1 or case2 or case3 or case4, output)
 
     def test_dumb_terminal_exits_cleanly(self):
-        env = os.environ.copy()
+        env = clean_env.copy()
         env.update({"TERM": "dumb"})
         output, exit_code = self.run_repl("exit()\n", env=env)
         self.assertEqual(exit_code, 0)
@@ -879,7 +887,7 @@ def test_dumb_terminal_exits_cleanly(self):
 
     @force_not_colorized
     def test_python_basic_repl(self):
-        env = os.environ.copy()
+        env = clean_env.copy()
         commands = ("from test.support import initialized_with_pyrepl\n"
                     "initialized_with_pyrepl()\n"
                     "exit()\n")
@@ -908,7 +916,7 @@ def test_not_wiping_history_file(self):
 
         hfile = tempfile.NamedTemporaryFile(delete=False)
         self.addCleanup(unlink, hfile.name)
-        env = os.environ.copy()
+        env = clean_env.copy()
         env["PYTHON_HISTORY"] = hfile.name
         commands = "123\nspam\nexit()\n"