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authorChristian Tismer <tismer@stackless.com>2019-08-22 13:09:43 +0200
committerChristian Tismer <tismer@stackless.com>2019-08-22 19:24:54 +0200
commit28958dfae22cc6e52dfb71c4b00c20aba72531a1 (patch)
tree61b8d680ce5935cdd984a8b1b9e36e5d8627b0ab /sources/shiboken2/shibokenmodule
parent01b43dc3d93e632c3c42fb8e1105f200b9cee2ae (diff)
Fix a typing bug in Python 2.7 and update
The typing module has problems if it exists twice. This gave trouble with matplotlib, when typing was imported and then called PySide indirectly. The only reliable cure appears to be to use the typing module if it is already in sys.modules . The typing27 modue was updated to the latest version of https://github.com/python/typing (original file with additional license headers). Fixes: PYSIDE-1073 Change-Id: Iebfdfe7fd51080a9334db332719928c001501381 Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
Diffstat (limited to 'sources/shiboken2/shibokenmodule')
-rw-r--r--sources/shiboken2/shibokenmodule/files.dir/shibokensupport/signature/loader.py10
-rw-r--r--sources/shiboken2/shibokenmodule/files.dir/shibokensupport/typing27.py515
2 files changed, 431 insertions, 94 deletions
diff --git a/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/signature/loader.py b/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/signature/loader.py
index 6c76483a..8192f9bc 100644
--- a/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/signature/loader.py
+++ b/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/signature/loader.py
@@ -151,12 +151,18 @@ def list_modules(message):
print(" {:23}".format(name), repr(module)[:70])
+orig_typing = True
if sys.version_info >= (3,):
import typing
import inspect
inspect.formatannotation = formatannotation
else:
- from shibokensupport import typing27 as typing
+ if "typing" not in sys.modules:
+ orig_typing = False
+ from shibokensupport import typing27 as typing
+ sys.modules["typing"] = typing
+ else:
+ import typing
import inspect
namespace = inspect.__dict__
from shibokensupport import backport_inspect as inspect
@@ -196,7 +202,7 @@ def move_into_pyside_package():
put_into_package(PySide2.support.signature, parser)
put_into_package(PySide2.support.signature.lib, enum_sig)
- put_into_package(PySide2.support.signature, typing)
+ put_into_package(None if orig_typing else PySide2.support.signature, typing)
put_into_package(PySide2.support.signature, inspect)
from shibokensupport.signature import mapping
diff --git a/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/typing27.py b/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/typing27.py
index 786a84ec..44d78c43 100644
--- a/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/typing27.py
+++ b/sources/shiboken2/shibokenmodule/files.dir/shibokensupport/typing27.py
@@ -86,6 +86,10 @@ PSF LICENSE AGREEMENT FOR PYTHON 3.7.0
to be bound by the terms and conditions of this License Agreement.
"""
+# This is the typing module for Python 2.7
+# https://github.com/python/typing
+# 2019-08-22
+
from __future__ import absolute_import, unicode_literals
import abc
@@ -108,8 +112,11 @@ __all__ = [
'Any',
'Callable',
'ClassVar',
+ 'Final',
'Generic',
+ 'Literal',
'Optional',
+ 'Protocol',
'Tuple',
'Type',
'TypeVar',
@@ -141,6 +148,7 @@ __all__ = [
'SupportsAbs',
'SupportsComplex',
'SupportsFloat',
+ 'SupportsIndex',
'SupportsInt',
# Concrete collection types.
@@ -152,17 +160,20 @@ __all__ = [
'Set',
'FrozenSet',
'NamedTuple', # Not really a type.
+ 'TypedDict', # Not really a type.
'Generator',
# One-off things.
'AnyStr',
'cast',
+ 'final',
'get_type_hints',
'NewType',
'no_type_check',
'no_type_check_decorator',
'NoReturn',
'overload',
+ 'runtime_checkable',
'Text',
'TYPE_CHECKING',
]
@@ -447,7 +458,7 @@ def _type_check(arg, msg):
if (
type(arg).__name__ in ('_Union', '_Optional') and
not getattr(arg, '__origin__', None) or
- isinstance(arg, TypingMeta) and arg._gorg in (Generic, _Protocol)
+ isinstance(arg, TypingMeta) and arg._gorg in (Generic, Protocol)
):
raise TypeError("Plain %s is not valid as type argument" % arg)
return arg
@@ -466,7 +477,7 @@ def _type_repr(obj):
return _qualname(obj)
return '%s.%s' % (obj.__module__, _qualname(obj))
if obj is Ellipsis:
- return('...')
+ return '...'
if isinstance(obj, types.FunctionType):
return obj.__name__
return repr(obj)
@@ -537,6 +548,157 @@ class _ClassVar(_FinalTypingBase):
ClassVar = _ClassVar(_root=True)
+class _FinalMeta(TypingMeta):
+ """Metaclass for _Final"""
+
+ def __new__(cls, name, bases, namespace):
+ cls.assert_no_subclassing(bases)
+ self = super(_FinalMeta, cls).__new__(cls, name, bases, namespace)
+ return self
+
+
+class _Final(_FinalTypingBase):
+ """A special typing construct to indicate that a name
+ cannot be re-assigned or overridden in a subclass.
+ For example:
+
+ MAX_SIZE: Final = 9000
+ MAX_SIZE += 1 # Error reported by type checker
+
+ class Connection:
+ TIMEOUT: Final[int] = 10
+ class FastConnector(Connection):
+ TIMEOUT = 1 # Error reported by type checker
+
+ There is no runtime checking of these properties.
+ """
+
+ __metaclass__ = _FinalMeta
+ __slots__ = ('__type__',)
+
+ def __init__(self, tp=None, **kwds):
+ self.__type__ = tp
+
+ def __getitem__(self, item):
+ cls = type(self)
+ if self.__type__ is None:
+ return cls(_type_check(item,
+ '{} accepts only single type.'.format(cls.__name__[1:])),
+ _root=True)
+ raise TypeError('{} cannot be further subscripted'
+ .format(cls.__name__[1:]))
+
+ def _eval_type(self, globalns, localns):
+ new_tp = _eval_type(self.__type__, globalns, localns)
+ if new_tp == self.__type__:
+ return self
+ return type(self)(new_tp, _root=True)
+
+ def __repr__(self):
+ r = super(_Final, self).__repr__()
+ if self.__type__ is not None:
+ r += '[{}]'.format(_type_repr(self.__type__))
+ return r
+
+ def __hash__(self):
+ return hash((type(self).__name__, self.__type__))
+
+ def __eq__(self, other):
+ if not isinstance(other, _Final):
+ return NotImplemented
+ if self.__type__ is not None:
+ return self.__type__ == other.__type__
+ return self is other
+
+
+Final = _Final(_root=True)
+
+
+def final(f):
+ """This decorator can be used to indicate to type checkers that
+ the decorated method cannot be overridden, and decorated class
+ cannot be subclassed. For example:
+
+ class Base:
+ @final
+ def done(self) -> None:
+ ...
+ class Sub(Base):
+ def done(self) -> None: # Error reported by type checker
+ ...
+ @final
+ class Leaf:
+ ...
+ class Other(Leaf): # Error reported by type checker
+ ...
+
+ There is no runtime checking of these properties.
+ """
+ return f
+
+
+class _LiteralMeta(TypingMeta):
+ """Metaclass for _Literal"""
+
+ def __new__(cls, name, bases, namespace):
+ cls.assert_no_subclassing(bases)
+ self = super(_LiteralMeta, cls).__new__(cls, name, bases, namespace)
+ return self
+
+
+class _Literal(_FinalTypingBase):
+ """A type that can be used to indicate to type checkers that the
+ corresponding value has a value literally equivalent to the
+ provided parameter. For example:
+
+ var: Literal[4] = 4
+
+ The type checker understands that 'var' is literally equal to the
+ value 4 and no other value.
+
+ Literal[...] cannot be subclassed. There is no runtime checking
+ verifying that the parameter is actually a value instead of a type.
+ """
+
+ __metaclass__ = _LiteralMeta
+ __slots__ = ('__values__',)
+
+ def __init__(self, values=None, **kwds):
+ self.__values__ = values
+
+ def __getitem__(self, item):
+ cls = type(self)
+ if self.__values__ is None:
+ if not isinstance(item, tuple):
+ item = (item,)
+ return cls(values=item,
+ _root=True)
+ raise TypeError('{} cannot be further subscripted'
+ .format(cls.__name__[1:]))
+
+ def _eval_type(self, globalns, localns):
+ return self
+
+ def __repr__(self):
+ r = super(_Literal, self).__repr__()
+ if self.__values__ is not None:
+ r += '[{}]'.format(', '.join(map(_type_repr, self.__values__)))
+ return r
+
+ def __hash__(self):
+ return hash((type(self).__name__, self.__values__))
+
+ def __eq__(self, other):
+ if not isinstance(other, _Literal):
+ return NotImplemented
+ if self.__values__ is not None:
+ return self.__values__ == other.__values__
+ return self is other
+
+
+Literal = _Literal(_root=True)
+
+
class AnyMeta(TypingMeta):
"""Metaclass for Any."""
@@ -1122,10 +1284,11 @@ class GenericMeta(TypingMeta, abc.ABCMeta):
if base is Generic:
raise TypeError("Cannot inherit from plain Generic")
if (isinstance(base, GenericMeta) and
- base.__origin__ is Generic):
+ base.__origin__ in (Generic, Protocol)):
if gvars is not None:
raise TypeError(
- "Cannot inherit from Generic[...] multiple types.")
+ "Cannot inherit from Generic[...] or"
+ " Protocol[...] multiple times.")
gvars = base.__parameters__
if gvars is None:
gvars = tvars
@@ -1135,8 +1298,10 @@ class GenericMeta(TypingMeta, abc.ABCMeta):
if not tvarset <= gvarset:
raise TypeError(
"Some type variables (%s) "
- "are not listed in Generic[%s]" %
+ "are not listed in %s[%s]" %
(", ".join(str(t) for t in tvars if t not in gvarset),
+ "Generic" if any(b.__origin__ is Generic
+ for b in bases) else "Protocol",
", ".join(str(g) for g in gvars)))
tvars = gvars
@@ -1285,25 +1450,21 @@ class GenericMeta(TypingMeta, abc.ABCMeta):
"Parameter list to %s[...] cannot be empty" % _qualname(self))
msg = "Parameters to generic types must be types."
params = tuple(_type_check(p, msg) for p in params)
- if self is Generic:
+ if self in (Generic, Protocol):
# Generic can only be subscripted with unique type variables.
if not all(isinstance(p, TypeVar) for p in params):
raise TypeError(
- "Parameters to Generic[...] must all be type variables")
+ "Parameters to %s[...] must all be type variables" % self.__name__)
if len(set(params)) != len(params):
raise TypeError(
- "Parameters to Generic[...] must all be unique")
+ "Parameters to %s[...] must all be unique" % self.__name__)
tvars = params
args = params
elif self in (Tuple, Callable):
tvars = _type_vars(params)
args = params
- elif self is _Protocol:
- # _Protocol is internal, don't check anything.
- tvars = params
- args = params
- elif self.__origin__ in (Generic, _Protocol):
- # Can't subscript Generic[...] or _Protocol[...].
+ elif self.__origin__ in (Generic, Protocol):
+ # Can't subscript Generic[...] or Protocol[...].
raise TypeError("Cannot subscript already-subscripted %s" %
repr(self))
else:
@@ -1343,7 +1504,7 @@ class GenericMeta(TypingMeta, abc.ABCMeta):
# latter, we must extend __instancecheck__ too. For simplicity
# we just skip the cache check -- instance checks for generic
# classes are supposed to be rare anyways.
- if not isinstance(instance, type):
+ if hasattr(instance, "__class__"):
return issubclass(instance.__class__, self)
return False
@@ -1690,85 +1851,175 @@ def overload(func):
return _overload_dummy
+_PROTO_WHITELIST = ['Callable', 'Iterable', 'Iterator',
+ 'Hashable', 'Sized', 'Container', 'Collection',
+ 'Reversible', 'ContextManager']
+
+
class _ProtocolMeta(GenericMeta):
- """Internal metaclass for _Protocol.
+ """Internal metaclass for Protocol.
- This exists so _Protocol classes can be generic without deriving
+ This exists so Protocol classes can be generic without deriving
from Generic.
"""
+ def __init__(cls, *args, **kwargs):
+ super(_ProtocolMeta, cls).__init__(*args, **kwargs)
+ if not cls.__dict__.get('_is_protocol', None):
+ cls._is_protocol = any(b is Protocol or
+ isinstance(b, _ProtocolMeta) and
+ b.__origin__ is Protocol
+ for b in cls.__bases__)
+ if cls._is_protocol:
+ for base in cls.__mro__[1:]:
+ if not (base in (object, Generic) or
+ base.__module__ == '_abcoll' and
+ base.__name__ in _PROTO_WHITELIST or
+ isinstance(base, TypingMeta) and base._is_protocol or
+ isinstance(base, GenericMeta) and base.__origin__ is Generic):
+ raise TypeError('Protocols can only inherit from other protocols,'
+ ' got %r' % base)
+ cls._callable_members_only = all(callable(getattr(cls, attr))
+ for attr in cls._get_protocol_attrs())
+
+ def _no_init(self, *args, **kwargs):
+ if type(self)._is_protocol:
+ raise TypeError('Protocols cannot be instantiated')
+ cls.__init__ = _no_init
+
+ def _proto_hook(cls, other):
+ if not cls.__dict__.get('_is_protocol', None):
+ return NotImplemented
+ if not isinstance(other, type):
+ # Similar error as for issubclass(1, int)
+ # (also not a chance for old-style classes)
+ raise TypeError('issubclass() arg 1 must be a new-style class')
+ for attr in cls._get_protocol_attrs():
+ for base in other.__mro__:
+ if attr in base.__dict__:
+ if base.__dict__[attr] is None:
+ return NotImplemented
+ break
+ else:
+ return NotImplemented
+ return True
+ if '__subclasshook__' not in cls.__dict__:
+ cls.__subclasshook__ = classmethod(_proto_hook)
- def __instancecheck__(self, obj):
- if _Protocol not in self.__bases__:
- return super(_ProtocolMeta, self).__instancecheck__(obj)
- raise TypeError("Protocols cannot be used with isinstance().")
+ def __instancecheck__(self, instance):
+ # We need this method for situations where attributes are assigned in __init__
+ if isinstance(instance, type):
+ # This looks like a fundamental limitation of Python 2.
+ # It cannot support runtime protocol metaclasses, On Python 2 classes
+ # cannot be correctly inspected as instances of protocols.
+ return False
+ if ((not getattr(self, '_is_protocol', False) or
+ self._callable_members_only) and
+ issubclass(instance.__class__, self)):
+ return True
+ if self._is_protocol:
+ if all(hasattr(instance, attr) and
+ (not callable(getattr(self, attr)) or
+ getattr(instance, attr) is not None)
+ for attr in self._get_protocol_attrs()):
+ return True
+ return super(GenericMeta, self).__instancecheck__(instance)
def __subclasscheck__(self, cls):
- if not self._is_protocol:
- # No structural checks since this isn't a protocol.
- return NotImplemented
+ if (self.__dict__.get('_is_protocol', None) and
+ not self.__dict__.get('_is_runtime_protocol', None)):
+ if (sys._getframe(1).f_globals['__name__'] in ['abc', 'functools'] or
+ # This is needed because we remove subclasses from unions on Python 2.
+ sys._getframe(2).f_globals['__name__'] == 'typing'):
+ return False
+ raise TypeError("Instance and class checks can only be used with"
+ " @runtime_checkable protocols")
+ if (self.__dict__.get('_is_runtime_protocol', None) and
+ not self._callable_members_only):
+ if sys._getframe(1).f_globals['__name__'] in ['abc', 'functools']:
+ return super(GenericMeta, self).__subclasscheck__(cls)
+ raise TypeError("Protocols with non-method members"
+ " don't support issubclass()")
+ return super(_ProtocolMeta, self).__subclasscheck__(cls)
- if self is _Protocol:
- # Every class is a subclass of the empty protocol.
- return True
+ def _get_protocol_attrs(self):
+ attrs = set()
+ for base in self.__mro__[:-1]: # without object
+ if base.__name__ in ('Protocol', 'Generic'):
+ continue
+ annotations = getattr(base, '__annotations__', {})
+ for attr in list(base.__dict__.keys()) + list(annotations.keys()):
+ if (not attr.startswith('_abc_') and attr not in (
+ '__abstractmethods__', '__annotations__', '__weakref__',
+ '_is_protocol', '_is_runtime_protocol', '__dict__',
+ '__args__', '__slots__', '_get_protocol_attrs',
+ '__next_in_mro__', '__parameters__', '__origin__',
+ '__orig_bases__', '__extra__', '__tree_hash__',
+ '__doc__', '__subclasshook__', '__init__', '__new__',
+ '__module__', '_MutableMapping__marker',
+ '__metaclass__', '_gorg', '_callable_members_only')):
+ attrs.add(attr)
+ return attrs
- # Find all attributes defined in the protocol.
- attrs = self._get_protocol_attrs()
- for attr in attrs:
- if not any(attr in d.__dict__ for d in cls.__mro__):
- return False
- return True
+class Protocol(object):
+ """Base class for protocol classes. Protocol classes are defined as::
- def _get_protocol_attrs(self):
- # Get all Protocol base classes.
- protocol_bases = []
- for c in self.__mro__:
- if getattr(c, '_is_protocol', False) and c.__name__ != '_Protocol':
- protocol_bases.append(c)
+ class Proto(Protocol):
+ def meth(self):
+ # type: () -> int
+ pass
- # Get attributes included in protocol.
- attrs = set()
- for base in protocol_bases:
- for attr in base.__dict__.keys():
- # Include attributes not defined in any non-protocol bases.
- for c in self.__mro__:
- if (c is not base and attr in c.__dict__ and
- not getattr(c, '_is_protocol', False)):
- break
- else:
- if (not attr.startswith('_abc_') and
- attr != '__abstractmethods__' and
- attr != '_is_protocol' and
- attr != '_gorg' and
- attr != '__dict__' and
- attr != '__args__' and
- attr != '__slots__' and
- attr != '_get_protocol_attrs' and
- attr != '__next_in_mro__' and
- attr != '__parameters__' and
- attr != '__origin__' and
- attr != '__orig_bases__' and
- attr != '__extra__' and
- attr != '__tree_hash__' and
- attr != '__module__'):
- attrs.add(attr)
+ Such classes are primarily used with static type checkers that recognize
+ structural subtyping (static duck-typing), for example::
- return attrs
+ class C:
+ def meth(self):
+ # type: () -> int
+ return 0
+
+ def func(x):
+ # type: (Proto) -> int
+ return x.meth()
+
+ func(C()) # Passes static type check
+ See PEP 544 for details. Protocol classes decorated with @typing.runtime_checkable
+ act as simple-minded runtime protocols that checks only the presence of
+ given attributes, ignoring their type signatures.
-class _Protocol(object):
- """Internal base class for protocol classes.
+ Protocol classes can be generic, they are defined as::
- This implements a simple-minded structural issubclass check
- (similar but more general than the one-offs in collections.abc
- such as Hashable).
+ class GenProto(Protocol[T]):
+ def meth(self):
+ # type: () -> T
+ pass
"""
__metaclass__ = _ProtocolMeta
__slots__ = ()
-
_is_protocol = True
+ def __new__(cls, *args, **kwds):
+ if cls._gorg is Protocol:
+ raise TypeError("Type Protocol cannot be instantiated; "
+ "it can be used only as a base class")
+ return _generic_new(cls.__next_in_mro__, cls, *args, **kwds)
+
+
+def runtime_checkable(cls):
+ """Mark a protocol class as a runtime protocol, so that it
+ can be used with isinstance() and issubclass(). Raise TypeError
+ if applied to a non-protocol class.
+
+ This allows a simple-minded structural check very similar to the
+ one-offs in collections.abc such as Hashable.
+ """
+ if not isinstance(cls, _ProtocolMeta) or not cls._is_protocol:
+ raise TypeError('@runtime_checkable can be only applied to protocol classes,'
+ ' got %r' % cls)
+ cls._is_runtime_protocol = True
+ return cls
+
# Various ABCs mimicking those in collections.abc.
# A few are simply re-exported for completeness.
@@ -1786,7 +2037,8 @@ class Iterator(Iterable[T_co]):
__extra__ = collections_abc.Iterator
-class SupportsInt(_Protocol):
+@runtime_checkable
+class SupportsInt(Protocol):
__slots__ = ()
@abstractmethod
@@ -1794,7 +2046,8 @@ class SupportsInt(_Protocol):
pass
-class SupportsFloat(_Protocol):
+@runtime_checkable
+class SupportsFloat(Protocol):
__slots__ = ()
@abstractmethod
@@ -1802,7 +2055,8 @@ class SupportsFloat(_Protocol):
pass
-class SupportsComplex(_Protocol):
+@runtime_checkable
+class SupportsComplex(Protocol):
__slots__ = ()
@abstractmethod
@@ -1810,7 +2064,17 @@ class SupportsComplex(_Protocol):
pass
-class SupportsAbs(_Protocol[T_co]):
+@runtime_checkable
+class SupportsIndex(Protocol):
+ __slots__ = ()
+
+ @abstractmethod
+ def __index__(self):
+ pass
+
+
+@runtime_checkable
+class SupportsAbs(Protocol[T_co]):
__slots__ = ()
@abstractmethod
@@ -1823,7 +2087,8 @@ if hasattr(collections_abc, 'Reversible'):
__slots__ = ()
__extra__ = collections_abc.Reversible
else:
- class Reversible(_Protocol[T_co]):
+ @runtime_checkable
+ class Reversible(Protocol[T_co]):
__slots__ = ()
@abstractmethod
@@ -1996,21 +2261,6 @@ class DefaultDict(collections.defaultdict, MutableMapping[KT, VT]):
return _generic_new(collections.defaultdict, cls, *args, **kwds)
-############################
-# Insertion by CT 2019-02-21
-#
-class OrderedDict(collections.OrderedDict, MutableMapping[KT, VT]):
- __slots__ = ()
- __extra__ = collections.OrderedDict
-
- def __new__(cls, *args, **kwds):
- if cls._gorg is OrderedDict:
- return collections.OrderedDict(*args, **kwds)
- return _generic_new(collections.OrderedDict, cls, *args, **kwds)
-#
-############################
-
-
class Counter(collections.Counter, Dict[T, int]):
__slots__ = ()
__extra__ = collections.Counter
@@ -2100,6 +2350,87 @@ def NamedTuple(typename, fields):
return cls
+def _check_fails(cls, other):
+ try:
+ if sys._getframe(1).f_globals['__name__'] not in ['abc', 'functools', 'typing']:
+ # Typed dicts are only for static structural subtyping.
+ raise TypeError('TypedDict does not support instance and class checks')
+ except (AttributeError, ValueError):
+ pass
+ return False
+
+
+def _dict_new(cls, *args, **kwargs):
+ return dict(*args, **kwargs)
+
+
+def _typeddict_new(cls, _typename, _fields=None, **kwargs):
+ total = kwargs.pop('total', True)
+ if _fields is None:
+ _fields = kwargs
+ elif kwargs:
+ raise TypeError("TypedDict takes either a dict or keyword arguments,"
+ " but not both")
+
+ ns = {'__annotations__': dict(_fields), '__total__': total}
+ try:
+ # Setting correct module is necessary to make typed dict classes pickleable.
+ ns['__module__'] = sys._getframe(1).f_globals.get('__name__', '__main__')
+ except (AttributeError, ValueError):
+ pass
+
+ return _TypedDictMeta(_typename, (), ns)
+
+
+class _TypedDictMeta(type):
+ def __new__(cls, name, bases, ns, total=True):
+ # Create new typed dict class object.
+ # This method is called directly when TypedDict is subclassed,
+ # or via _typeddict_new when TypedDict is instantiated. This way
+ # TypedDict supports all three syntaxes described in its docstring.
+ # Subclasses and instances of TypedDict return actual dictionaries
+ # via _dict_new.
+ ns['__new__'] = _typeddict_new if name == b'TypedDict' else _dict_new
+ tp_dict = super(_TypedDictMeta, cls).__new__(cls, name, (dict,), ns)
+
+ anns = ns.get('__annotations__', {})
+ msg = "TypedDict('Name', {f0: t0, f1: t1, ...}); each t must be a type"
+ anns = {n: _type_check(tp, msg) for n, tp in anns.items()}
+ for base in bases:
+ anns.update(base.__dict__.get('__annotations__', {}))
+ tp_dict.__annotations__ = anns
+ if not hasattr(tp_dict, '__total__'):
+ tp_dict.__total__ = total
+ return tp_dict
+
+ __instancecheck__ = __subclasscheck__ = _check_fails
+
+
+TypedDict = _TypedDictMeta(b'TypedDict', (dict,), {})
+TypedDict.__module__ = __name__
+TypedDict.__doc__ = \
+ """A simple typed name space. At runtime it is equivalent to a plain dict.
+
+ TypedDict creates a dictionary type that expects all of its
+ instances to have a certain set of keys, with each key
+ associated with a value of a consistent type. This expectation
+ is not checked at runtime but is only enforced by type checkers.
+ Usage::
+
+ Point2D = TypedDict('Point2D', {'x': int, 'y': int, 'label': str})
+
+ a: Point2D = {'x': 1, 'y': 2, 'label': 'good'} # OK
+ b: Point2D = {'z': 3, 'label': 'bad'} # Fails type check
+
+ assert Point2D(x=1, y=2, label='first') == dict(x=1, y=2, label='first')
+
+ The type info could be accessed via Point2D.__annotations__. TypedDict
+ supports an additional equivalent form::
+
+ Point2D = TypedDict('Point2D', x=int, y=int, label=str)
+ """
+
+
def NewType(name, tp):
"""NewType creates simple unique types with almost zero
runtime overhead. NewType(name, tp) is considered a subtype of tp