Issue #20599: Force ASCII encoding for stdout in test_cleanup() of test_builtin
On Windows, the codec of sys.stdout is implemented in Python. At exit, the
codec may be unloaded before the destructor tries to write something to
sys.stdout.
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 8a307b9..5c14de3 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1604,10 +1604,10 @@
class C:
def __del__(self):
- print("before", flush=True)
+ print("before")
# Check that builtins still exist
len(())
- print("after", flush=True)
+ print("after")
c = C()
# Make this module survive until builtins and sys are cleaned
@@ -1617,7 +1617,15 @@
# through a GC phase.
here = sys.modules[__name__]
"""
- rc, out, err = assert_python_ok("-c", code)
+ # Issue #20599: Force ASCII encoding to get a codec implemented in C,
+ # otherwise the codec may be unloaded before C.__del__() is called, and
+ # so print("before") fails because the codec cannot be used to encode
+ # "before" to sys.stdout.encoding. For example, on Windows,
+ # sys.stdout.encoding is the OEM code page and these code pages are
+ # implemented in Python
+ rc, out, err = assert_python_ok("-c", code,
+ PYTHONIOENCODING="ascii",
+ __cleanenv=True)
self.assertEqual(["before", "after"], out.decode().splitlines())