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+"""Defines experimental extensions to the standard "typing" module that are
+supported by the mypy typechecker.
+
+Example usage:
+ from mypy_extensions import TypedDict
+"""
+
+from typing import Any
+
+import sys
+# _type_check is NOT a part of public typing API, it is used here only to mimic
+# the (convenient) behavior of types provided by typing module.
+from typing import _type_check # type: ignore
+
+
+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 == '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('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 typecheckers.
+ 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 two additional equivalent forms::
+
+ Point2D = TypedDict('Point2D', x=int, y=int, label=str)
+
+ class Point2D(TypedDict):
+ x: int
+ y: int
+ label: str
+
+ The latter syntax is only supported in Python 3.6+, while two other
+ syntax forms work for 3.2+
+ """
+
+# Argument constructors for making more-detailed Callables. These all just
+# return their type argument, to make them complete noops in terms of the
+# `typing` module.
+
+
+def Arg(type=Any, name=None):
+ """A normal positional argument"""
+ return type
+
+
+def DefaultArg(type=Any, name=None):
+ """A positional argument with a default value"""
+ return type
+
+
+def NamedArg(type=Any, name=None):
+ """A keyword-only argument"""
+ return type
+
+
+def DefaultNamedArg(type=Any, name=None):
+ """A keyword-only argument with a default value"""
+ return type
+
+
+def VarArg(type=Any):
+ """A *args-style variadic positional argument"""
+ return type
+
+
+def KwArg(type=Any):
+ """A **kwargs-style variadic keyword argument"""
+ return type
+
+
+# Return type that indicates a function does not return
+class NoReturn: pass
+
+
+def trait(cls):
+ return cls
+
+
+def mypyc_attr(*attrs, **kwattrs):
+ return lambda x: x
+
+
+# TODO: We may want to try to properly apply this to any type
+# variables left over...
+class _FlexibleAliasClsApplied:
+ def __init__(self, val):
+ self.val = val
+
+ def __getitem__(self, args):
+ return self.val
+
+
+class _FlexibleAliasCls:
+ def __getitem__(self, args):
+ return _FlexibleAliasClsApplied(args[-1])
+
+
+FlexibleAlias = _FlexibleAliasCls()
+
+
+class _NativeIntMeta(type):
+ def __instancecheck__(cls, inst):
+ return isinstance(inst, int)
+
+
+_sentinel = object()
+
+
+class i64(metaclass=_NativeIntMeta):
+ def __new__(cls, x=0, base=_sentinel):
+ if base is not _sentinel:
+ return int(x, base)
+ return int(x)
+
+
+class i32(metaclass=_NativeIntMeta):
+ def __new__(cls, x=0, base=_sentinel):
+ if base is not _sentinel:
+ return int(x, base)
+ return int(x)
+
+
+class i16(metaclass=_NativeIntMeta):
+ def __new__(cls, x=0, base=_sentinel):
+ if base is not _sentinel:
+ return int(x, base)
+ return int(x)
+
+
+class u8(metaclass=_NativeIntMeta):
+ def __new__(cls, x=0, base=_sentinel):
+ if base is not _sentinel:
+ return int(x, base)
+ return int(x)
+
+
+for _int_type in i64, i32, i16, u8:
+ _int_type.__doc__ = \
+ """A native fixed-width integer type when used with mypyc.
+
+ In code not compiled with mypyc, behaves like the 'int' type in these
+ runtime contexts:
+
+ * {name}(x[, base=n]) converts a number or string to 'int'
+ * isinstance(x, {name}) is the same as isinstance(x, int)
+ """.format(name=_int_type.__name__)
+del _int_type