Set ( set, MutableSet ) ¶Ī generic version of t. T = TypeVar ( 'T', int, float ) def vec2 ( x : T, y : T ) -> List : return def keep_positives ( vector : Sequence ) -> List : return class typing. Collection ( Sized, Iterable, Container ) ¶Ī generic version of Container ( Generic ) ¶Ī generic version of. SupportsRound ¶Īn ABC with one abstract method _round_ SupportsAbs ¶Īn ABC with one abstract method _abs_ that is covariant SupportsBytes ¶Īn ABC with one abstract method _bytes_. SupportsComplex ¶Īn ABC with one abstract method _complex_. SupportsFloat ¶Īn ABC with one abstract method _float_. SupportsInt ¶Īn ABC with one abstract method _int_. Reversible ( Iterable ) ¶Ī generic version of. Iterator ( Iterable ) ¶Ī generic version of. Iterable ( Generic ) ¶Ī generic version of. Instantiation of this class with one or more type variables.įor example, a generic mapping type might be defined as: This means that an actual type substituted (explicitly or implicitly)įor the type variable must be a subclass of the boundary type,Ī generic type is typically declared by inheriting from an Alternatively,Ī type variable may specify an upper bound using bound=. Type variables may be marked covariant or contravariant by passingĬovariant=True or contravariant=True. Isinstance() and issubclass() should not be used with types. That if the arguments are instances of some subclass of str,Īt runtime, isinstance(x, T) will raise TypeError. Of (str, str) -> str and (bytes, bytes) -> bytes. The latter example’s signature is essentially the overloading Def repeat ( x : T, n : int ) -> Sequence : """Return a list containing n references to x.""" return * 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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