Reverse the meaning of is_argument when used for type check (GH-7039)
(cherry picked from commit 0e61dffdbaf39ac5916ce431ff3b37db8faa1d2d)
Co-authored-by: Nina Zakharenko <nzakharenko@gmail.com>
diff --git a/Lib/typing.py b/Lib/typing.py
index 3e82c6b..18b04cf 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -106,7 +106,7 @@
# legitimate imports of those modules.
-def _type_check(arg, msg, is_argument=False):
+def _type_check(arg, msg, is_argument=True):
"""Check that the argument is a type, and return it (internal helper).
As a special case, accept None and return type(None) instead. Also wrap strings
@@ -119,7 +119,7 @@
We append the repr() of the actual value (truncated to 100 chars).
"""
invalid_generic_forms = (Generic, _Protocol)
- if not is_argument:
+ if is_argument:
invalid_generic_forms = invalid_generic_forms + (ClassVar, )
if arg is None:
@@ -445,7 +445,7 @@
'__forward_evaluated__', '__forward_value__',
'__forward_is_argument__')
- def __init__(self, arg, is_argument=False):
+ def __init__(self, arg, is_argument=True):
if not isinstance(arg, str):
raise TypeError(f"Forward reference must be a string -- got {arg!r}")
try:
@@ -979,7 +979,7 @@
if value is None:
value = type(None)
if isinstance(value, str):
- value = ForwardRef(value, is_argument=True)
+ value = ForwardRef(value, is_argument=False)
value = _eval_type(value, base_globals, localns)
hints[name] = value
return hints