bpo-43651: PEP 597: Fix EncodingWarning in some tests (GH-25145)

* test_asyncio
* test_bz2
* test_math
* test_cmath
* test_cmd_line
* test_cmd_line_script
* test_compile
* test_contextlib
* test_profile
* ctypes/test/test_find
* test_multiprocessing
* test_configparser
* test_csv
* test_dbm_dumb
* test_decimal
* test_difflib
* os.fdopen() calls io.text_encoding() to emit EncodingWarning for right place.

1 files changed, 3 insertions, 3 deletions

diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index 25d3eec..3758767 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -512,7 +512,7 @@ class CmdLineTest(unittest.TestCase):
         # the dict whereas the module was destroyed
         filename = os_helper.TESTFN
         self.addCleanup(os_helper.unlink, filename)
-        with open(filename, "w") as script:
+        with open(filename, "w", encoding="utf-8") as script:
             print("import sys", file=script)
             print("del sys.modules['__main__']", file=script)
         assert_python_ok(filename)
@@ -549,9 +549,9 @@ class CmdLineTest(unittest.TestCase):
         with os_helper.temp_cwd() as tmpdir:
             fake = os.path.join(tmpdir, "uuid.py")
             main = os.path.join(tmpdir, "main.py")
-            with open(fake, "w") as f:
+            with open(fake, "w", encoding="utf-8") as f:
                 f.write("raise RuntimeError('isolated mode test')\n")
-            with open(main, "w") as f:
+            with open(main, "w", encoding="utf-8") as f:
                 f.write("import uuid\n")
                 f.write("print('ok')\n")
             self.assertRaises(subprocess.CalledProcessError,