Issue #9992: Remove PYTHONFSENCODING environment variable.

Lib/test/test_os.py

@@ -1172,36 +1172,6 @@ class FSEncodingTests(unittest.TestCase):
                 continue
             self.assertEquals(os.fsdecode(bytesfn), fn)
 
-    def get_output(self, fs_encoding, func):
-        env = os.environ.copy()
-        env['PYTHONIOENCODING'] = 'utf-8'
-        env['PYTHONFSENCODING'] = fs_encoding
-        code = 'import os; print(%s, end="")' % func
-        process = subprocess.Popen(
-            [sys.executable, "-c", code],
-            stdout=subprocess.PIPE, env=env)
-        stdout, stderr = process.communicate()
-        self.assertEqual(process.returncode, 0)
-        return stdout.decode('utf-8')
-
-    @unittest.skipIf(sys.platform in ('win32', 'darwin'),
-                     'PYTHONFSENCODING is ignored on Windows and Mac OS X')
-    def test_encodings(self):
-        def check(encoding, bytesfn, unicodefn):
-            encoded = self.get_output(encoding, 'repr(os.fsencode(%a))' % unicodefn)
-            self.assertEqual(encoded, repr(bytesfn))
-
-            decoded = self.get_output(encoding, 'repr(os.fsdecode(%a))' % bytesfn)
-            self.assertEqual(decoded, repr(unicodefn))
-
-        check('utf-8', b'\xc3\xa9\x80', '\xe9\udc80')
-
-        # Raise SkipTest() if sys.executable is not encodable to ascii
-        support.workaroundIssue8611()
-
-        check('ascii', b'abc\xff', 'abc\udcff')
-        check('iso-8859-15', b'\xef\xa4', '\xef\u20ac')
-
 
 class PidTests(unittest.TestCase):
     @unittest.skipUnless(hasattr(os, 'getppid'), "test needs os.getppid")

Lib/test/test_subprocess.py

@@ -885,10 +885,6 @@ class POSIXProcessTestCase(BaseTestCase):
             script = "import os; print(ascii(os.getenv(%s)))" % repr(key)
             env = os.environ.copy()
             env[key] = value
-            # Force surrogate-escaping of \xFF in the child process;
-            # otherwise it can be decoded as-is if the default locale
-            # is latin-1.
-            env['PYTHONFSENCODING'] = 'ascii'
             stdout = subprocess.check_output(
                 [sys.executable, "-c", script],
                 env=env)

Lib/test/test_sys.py

@@ -602,35 +602,6 @@ class SysModuleTest(unittest.TestCase):
             expected = None
         self.check_fsencoding(fs_encoding, expected)
 
-    @unittest.skipIf(sys.platform in ('win32', 'darwin'),
-                     'PYTHONFSENCODING is ignored on Windows and Mac OS X')
-    def test_pythonfsencoding(self):
-        def get_fsencoding(env):
-            output = subprocess.check_output(
-                [sys.executable, "-c",
-                 "import sys; print(sys.getfilesystemencoding())"],
-                env=env)
-            return output.rstrip().decode('ascii')
-
-        # Raise SkipTest() if sys.executable is not encodable to ascii
-        test.support.workaroundIssue8611()
-
-        # Use C locale to get ascii for the locale encoding
-        env = os.environ.copy()
-        env['LC_ALL'] = 'C'
-        try:
-            del env['PYTHONFSENCODING']
-        except KeyError:
-            pass
-        self.check_fsencoding(get_fsencoding(env), 'ascii')
-
-        # Filesystem encoding is hardcoded on Windows and Mac OS X
-        for encoding in ('ascii', 'cp850', 'iso8859-1', 'utf-8'):
-            env = os.environ.copy()
-            env['PYTHONFSENCODING'] = encoding
-            self.check_fsencoding(get_fsencoding(env), encoding)
-
-
 
 class SizeofTest(unittest.TestCase):