bpo-39377: json: Remove the encoding option. (GH-18075)

Lib/json/__init__.py

@@ -329,8 +329,6 @@ def loads(s, *, cls=None, object_hook=None, parse_float=None,
 
     To use a custom ``JSONDecoder`` subclass, specify it with the ``cls``
     kwarg; otherwise ``JSONDecoder`` is used.
-
-    The ``encoding`` argument is ignored and deprecated since Python 3.1.
     """
     if isinstance(s, str):
         if s.startswith('\ufeff'):
@@ -342,15 +340,6 @@ def loads(s, *, cls=None, object_hook=None, parse_float=None,
                             f'not {s.__class__.__name__}')
         s = s.decode(detect_encoding(s), 'surrogatepass')
 
-    if "encoding" in kw:
-        import warnings
-        warnings.warn(
-            "'encoding' is ignored and deprecated. It will be removed in Python 3.9",
-            DeprecationWarning,
-            stacklevel=2
-        )
-        del kw['encoding']
-
     if (cls is None and object_hook is None and
             parse_int is None and parse_float is None and
             parse_constant is None and object_pairs_hook is None and not kw):

Lib/test/test_json/test_decode.py

@@ -95,9 +95,5 @@ class TestDecode:
         d = self.json.JSONDecoder()
         self.assertRaises(ValueError, d.raw_decode, 'a'*42, -50000)
 
-    def test_deprecated_encode(self):
-        with self.assertWarns(DeprecationWarning):
-            self.loads('{}', encoding='fake')
-
 class TestPyDecode(TestDecode, PyTest): pass
 class TestCDecode(TestDecode, CTest): pass

Misc/NEWS.d/next/Library/2020-01-20-13-00-35.bpo-39377.QSFdaU.rst

@@ -0,0 +1,2 @@
+Removed ``encoding`` option from :func:`json.loads`.  It has been deprecated
+since Python 3.1.