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a3 Special type construct to mark class variables.
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class Starship:
stats: ClassVar[Dict[str, int]] = {} # class variable
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class FastConnector(Connection):
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There is no runtime checking of these properties.
a' Union type; Union[X, Y] means either X or Y.
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...
MODE = Literal['r', 'rb', 'w', 'wb']
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...
open_helper('/some/path', 'r') # Passes type check
open_helper('/other/path', 'typo') # Error in type checker
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as for generic function definitions. See class Generic for more
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def repeat(x: T, n: int) -> List[T]:
'''Return a list containing n references to x.'''
return [x]*n
def longest(x: A, y: A) -> A:
'''Return the longest of two strings.'''
return x if len(x) >= len(y) else y
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At runtime, isinstance(x, T) and issubclass(C, T) will raise TypeError.
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See PEP 484 for more details. By default generic types are invariant
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This is equivalent to::
Employee = collections.namedtuple('Employee', ['name', 'id'])
The resulting class has an extra __annotations__ attribute, giving a
dict that maps field names to types. (The field names are also in
the _fields attribute, which is part of the namedtuple API.)
Alternative equivalent keyword syntax is also accepted::
Employee = NamedTuple('Employee', name=str, id=int)
In Python versions <= 3.5 use::
Employee = NamedTuple('Employee', [('name', str), ('id', int)])
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t |d�s�||_ |S )ag Create new typed dict class object.
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r> r� r' z?TypedDict('Name', {f0: t0, f1: t1, ...}); each t must be a typec s i | ]\}}|t |� ��qS rZ r� )rg ru rw r� rZ r[ �
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z_TypedDictMeta.__new__)T)rb r^ r_ r� r� r� r� r� rZ rZ r� r[ r� � s r� c @ s e Zd ZdZdS )r> a� A simple typed namespace. At runtime it is equivalent to a plain dict.
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is not checked at runtime but is only enforced by type checkers.
Usage::
class Point2D(TypedDict):
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 can be accessed via Point2D.__annotations__. TypedDict
supports two additional equivalent forms::
Point2D = TypedDict('Point2D', x=int, y=int, label=str)
Point2D = TypedDict('Point2D', {'x': int, 'y': int, 'label': str})
By default, all keys must be present in a TypedDict. It is possible
to override this by specifying totality.
Usage::
class point2D(TypedDict, total=False):
x: int
y: int
This means that a point2D TypedDict can have any of the keys omitted.A type
checker is only expected to support a literal False or True as the value of
the total argument. True is the default, and makes all items defined in the
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syntax forms work for Python 2.7 and 3.2+
Nr$ rZ rZ rZ r[ r> � s c C s dd� }| |_ ||_|S )a% NewType creates simple unique types with almost zero
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UserId = NewType('UserId', int)
def name_by_id(user_id: UserId) -> str:
...
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name_by_id(42) # Fails type check
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