#23925: stop (eg) PYTHONSTARTUP from causing test_cmd_line failure.
Patch by Jamiel Almeida.
diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index 3683a48..cb9bbdd 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -271,7 +271,11 @@
def test_displayhook_unencodable(self):
for encoding in ('ascii', 'latin-1', 'utf-8'):
- env = os.environ.copy()
+ # We are testing a PYTHON environment variable here, so we can't
+ # use -E, -I, or script_helper (which uses them). So instead we do
+ # poor-man's isolation by deleting the PYTHON vars from env.
+ env = {key:value for (key,value) in os.environ.copy().items()
+ if not key.startswith('PYTHON')}
env['PYTHONIOENCODING'] = encoding
p = subprocess.Popen(
[sys.executable, '-i'],