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Update typing.py: remove isinstance() support (Mark struck it from the PEP).
This commit is contained in:
Guido van Rossum
parent
b980c05ef8
commit
43a79cc552
2 changed files with 71 additions and 330 deletions
156
Lib/typing.py
156
Lib/typing.py
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@ -176,6 +176,9 @@ class _ForwardRef(TypingMeta):
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self.__forward_evaluated__ = True
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return self.__forward_value__
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def __instancecheck__(self, obj):
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raise TypeError("Forward references cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if not self.__forward_evaluated__:
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globalns = self.__forward_frame__.f_globals
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@ -186,16 +189,6 @@ class _ForwardRef(TypingMeta):
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return False # Too early.
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return issubclass(cls, self.__forward_value__)
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def __instancecheck__(self, obj):
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if not self.__forward_evaluated__:
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globalns = self.__forward_frame__.f_globals
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localns = self.__forward_frame__.f_locals
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try:
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self._eval_type(globalns, localns)
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except NameError:
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return False # Too early.
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return isinstance(obj, self.__forward_value__)
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def __repr__(self):
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return '_ForwardRef(%r)' % (self.__forward_arg__,)
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@ -259,8 +252,7 @@ class _TypeAlias:
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self.impl_type, self.type_checker)
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def __instancecheck__(self, obj):
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return (isinstance(obj, self.impl_type) and
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isinstance(self.type_checker(obj), self.type_var))
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raise TypeError("Type aliases cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if cls is Any:
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@ -332,8 +324,8 @@ class AnyMeta(TypingMeta):
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self = super().__new__(cls, name, bases, namespace, _root=_root)
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return self
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def __instancecheck__(self, instance):
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return True
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def __instancecheck__(self, obj):
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raise TypeError("Any cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if not isinstance(cls, type):
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@ -548,9 +540,8 @@ class UnionMeta(TypingMeta):
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def __hash__(self):
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return hash(self.__union_set_params__)
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def __instancecheck__(self, instance):
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return (self.__union_set_params__ is not None and
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any(isinstance(instance, t) for t in self.__union_params__))
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def __instancecheck__(self, obj):
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raise TypeError("Unions cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if cls is Any:
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@ -709,18 +700,8 @@ class TupleMeta(TypingMeta):
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def __hash__(self):
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return hash(self.__tuple_params__)
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def __instancecheck__(self, t):
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if not isinstance(t, tuple):
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return False
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if self.__tuple_params__ is None:
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return True
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if self.__tuple_use_ellipsis__:
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p = self.__tuple_params__[0]
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return all(isinstance(x, p) for x in t)
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else:
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return (len(t) == len(self.__tuple_params__) and
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all(isinstance(x, p)
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for x, p in zip(t, self.__tuple_params__)))
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def __instancecheck__(self, obj):
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raise TypeError("Tuples cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if cls is Any:
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@ -826,57 +807,14 @@ class CallableMeta(TypingMeta):
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def __hash__(self):
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return hash(self.__args__) ^ hash(self.__result__)
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def __instancecheck__(self, instance):
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if not callable(instance):
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return False
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def __instancecheck__(self, obj):
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# For unparametrized Callable we allow this, because
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# typing.Callable should be equivalent to
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# collections.abc.Callable.
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if self.__args__ is None and self.__result__ is None:
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return True
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assert self.__args__ is not None
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assert self.__result__ is not None
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my_args, my_result = self.__args__, self.__result__
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import inspect # TODO: Avoid this import.
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# Would it be better to use Signature objects?
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try:
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(args, varargs, varkw, defaults, kwonlyargs, kwonlydefaults,
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annotations) = inspect.getfullargspec(instance)
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except TypeError:
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return False # We can't find the signature. Give up.
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msg = ("When testing isinstance(<callable>, Callable[...], "
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"<calleble>'s annotations must be types.")
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if my_args is not Ellipsis:
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if kwonlyargs and (not kwonlydefaults or
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len(kwonlydefaults) < len(kwonlyargs)):
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return False
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if isinstance(instance, types.MethodType):
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# For methods, getfullargspec() includes self/cls,
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# but it's not part of the call signature, so drop it.
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del args[0]
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min_call_args = len(args)
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if defaults:
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min_call_args -= len(defaults)
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if varargs:
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max_call_args = 999999999
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if len(args) < len(my_args):
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args += [varargs] * (len(my_args) - len(args))
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else:
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max_call_args = len(args)
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if not min_call_args <= len(my_args) <= max_call_args:
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return False
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for my_arg_type, name in zip(my_args, args):
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if name in annotations:
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annot_type = _type_check(annotations[name], msg)
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else:
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annot_type = Any
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if not issubclass(my_arg_type, annot_type):
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return False
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# TODO: If mutable type, check invariance?
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if 'return' in annotations:
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annot_return_type = _type_check(annotations['return'], msg)
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# Note contravariance here!
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if not issubclass(annot_return_type, my_result):
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return False
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# Can't find anything wrong...
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return True
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return isinstance(obj, collections_abc.Callable)
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else:
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raise TypeError("Callable[] cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if cls is Any:
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@ -1073,13 +1011,6 @@ class GenericMeta(TypingMeta, abc.ABCMeta):
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return False
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return issubclass(cls, self.__extra__)
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def __instancecheck__(self, obj):
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if super().__instancecheck__(obj):
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return True
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if self.__extra__ is None:
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return False
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return isinstance(obj, self.__extra__)
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class Generic(metaclass=GenericMeta):
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"""Abstract base class for generic types.
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@ -1234,6 +1165,9 @@ class _ProtocolMeta(GenericMeta):
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from Generic.
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"""
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def __instancecheck__(self, obj):
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raise TypeError("Protocols cannot be used with isinstance().")
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def __subclasscheck__(self, cls):
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if not self._is_protocol:
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# No structural checks since this isn't a protocol.
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@ -1399,19 +1333,7 @@ class ByteString(Sequence[int], extra=collections_abc.ByteString):
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ByteString.register(type(memoryview(b'')))
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class _ListMeta(GenericMeta):
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def __instancecheck__(self, obj):
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if not super().__instancecheck__(obj):
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return False
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itemtype = self.__parameters__[0]
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for x in obj:
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if not isinstance(x, itemtype):
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return False
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return True
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class List(list, MutableSequence[T], metaclass=_ListMeta):
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class List(list, MutableSequence[T]):
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def __new__(cls, *args, **kwds):
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if _geqv(cls, List):
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@ -1420,19 +1342,7 @@ class List(list, MutableSequence[T], metaclass=_ListMeta):
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return list.__new__(cls, *args, **kwds)
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class _SetMeta(GenericMeta):
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def __instancecheck__(self, obj):
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if not super().__instancecheck__(obj):
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return False
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itemtype = self.__parameters__[0]
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for x in obj:
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if not isinstance(x, itemtype):
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return False
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return True
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class Set(set, MutableSet[T], metaclass=_SetMeta):
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class Set(set, MutableSet[T]):
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def __new__(cls, *args, **kwds):
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if _geqv(cls, Set):
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@ -1441,7 +1351,7 @@ class Set(set, MutableSet[T], metaclass=_SetMeta):
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return set.__new__(cls, *args, **kwds)
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class _FrozenSetMeta(_SetMeta):
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class _FrozenSetMeta(GenericMeta):
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"""This metaclass ensures set is not a subclass of FrozenSet.
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Without this metaclass, set would be considered a subclass of
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@ -1454,11 +1364,6 @@ class _FrozenSetMeta(_SetMeta):
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return False
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return super().__subclasscheck__(cls)
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def __instancecheck__(self, obj):
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if issubclass(obj.__class__, Set):
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return False
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return super().__instancecheck__(obj)
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class FrozenSet(frozenset, AbstractSet[T_co], metaclass=_FrozenSetMeta):
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@ -1488,20 +1393,7 @@ class ValuesView(MappingView[VT_co], extra=collections_abc.ValuesView):
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pass
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class _DictMeta(GenericMeta):
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def __instancecheck__(self, obj):
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if not super().__instancecheck__(obj):
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return False
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keytype, valuetype = self.__parameters__
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for key, value in obj.items():
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if not (isinstance(key, keytype) and
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isinstance(value, valuetype)):
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return False
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return True
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class Dict(dict, MutableMapping[KT, VT], metaclass=_DictMeta):
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class Dict(dict, MutableMapping[KT, VT]):
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def __new__(cls, *args, **kwds):
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if _geqv(cls, Dict):
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