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...callable. def bar(x: int, *args: bool) -> int: ... def add(x: Callable[P, int]) -> Callable[Concatenate[str, P], bool]: ... add(bar) # Should return (__a: str, x: int, *args: bool) -> bool def remove(x: Callable[Concatenate[int, P], int]) -> Callable[P, bool]: ... remove(bar) # Should return (*args: bool) -> bool def transform( x: Callable[Concatenate[int, P], int] ) -> Callable[Concatenate[str, P], bool]: ... transform(bar) # Should return (__a: str, *args: b...
...CallableTypeArgument] return_type: object class CallableTypeArgument: kind: CallableTypeArgumentKind annotation: object @enum.global_enum class CallableTypeArgumentKind(enum.IntEnum): POSITIONAL_ONLY: int = ... PARAM_SPEC: int = ... The evaluation rules are expressed in terms of the following pseudocode: def evaluate_callable_type( callable_type: ast.CallableType | ast.AsyncCallableType: ) -> CallableType: return CallableType( is_async=isinstance(callabl...
...callables. The inspect.Signature.from_callable() function computes the signature of a callable. If an object has a __signature__ property, then inspect.Signature.from_callable() simply returns that. To further support duck-typing, if a callable has a __text_signature__ then the __signature__ will be created from that. This means that 3rd party builtin-functions can implement __text_signature__ if sufficient, and the more expensive __signature__ if necessary. Efficient calls to third-party call...
...callable.'' (Types are not classes, by the way. See questions 4.2, 4.19 and in particular 6.22 in the Python FAQ for more on this topic.) The base class is B; this one's easy. Since B is a class, its type is ``class''; so the type of the base class is the type ``class''. This is also known as types.ClassType, assuming the standard module types has been imported. Now is the type ``class'' callable? No, because types (in core Python) are never callable. Classes are ca...
...callable" to mean "a function, method, class, or an instance with a __call__ method". It is up to the server, gateway, or application implementing the callable to choose the appropriate implementation technique for their needs. Conversely, a server, gateway, or application that is invoking a callable must not have any dependency on what kind of callable was provided to it. Callables are only to be called, not introspected upon. The Application/Framework Side The application object is simply ...
...callable" to mean "a function, method, class, or an instance with a __call__ method". It is up to the server, gateway, or application implementing the callable to choose the appropriate implementation technique for their needs. Conversely, a server, gateway, or application that is invoking a callable must not have any dependency on what kind of callable was provided to it. Callables are only to be called, not introspected upon. A Note On String Types In general, HTTP deals with bytes, which ...
...callable fn to the future that will be called when the future is cancelled or finishes running. fn will be called with the future as its only argument. Added callables are called in the order that they were added and are always called in a thread belonging to the process that added them. If the callable raises an Exception then it will be logged and ignored. If the callable raises another BaseException then behavior is not defined. If the future has already completed or been cancelled then fn...
...Callable PEP:336 Title:Make None Callable Author:Andrew McClelland <eternalsquire at comcast.net> Status:Rejected Type:Standards Track Created:28-Oct-2004 Post-History: Contents Abstract BDFL Pronouncement Motivation Rationale How To Use References Copyright Abstract None should be a callable object that when called with any arguments has no side effect and returns None. BDFL Pronouncement This PEP is rejected. It is considered a feature that None raises an error wh...
...callable Instances of staticmethod and classmethod should be callable. Admittedly, there is no strong use case for this, but it has occasionally been requested (see for example [1]). Making static/class methods callable would increase consistency. First of all, function decorators typically add functionality or modify a function, but the result remains callable. This is not true for @staticmethod and @classmethod. Second, class methods of extension types are already callable: >>> fromh...
...callable types follows that of the return types. Examples: Callable[[], int] is a subtype of Callable[[], float]. Callable[[], Manager] is a subtype of Callable[[], Employee]. While for two callable types that differ only in the type of one argument, the subtype relationship for the callable types goes in the opposite direction as for the argument types. Examples: Callable[[float], None] is a subtype of Callable[[int], None]. Callable[[Employee], None] is a subtype of Callable[[Manager], None...
...callable class that allows a new callable to be constructed from a callable and a partial argument list (including positional and keyword arguments). I propose a standard library module called "functional", to hold useful higher-order functions, including the implementation of partial(). An implementation has been submitted to SourceForge [2]. Acceptance Patch #941881 was accepted and applied in 2005 for Py2.5. It is essentially as outlined here, a partial() type constructor binding leftmost ...
...callable which take one argument, the module instance. They are registered by the dotted name of the module, e.g. 'os' or 'os.path'. The callable are stored in the dict sys.post_import_hooks which is a mapping from names (as string) to a list of callables or None. States No hook was registered sys.post_import_hooks contains no entry for the module A hook is registered and the module is not loaded yet The import hook registry contains an entry sys.post_import_hooks["name"] = [hook1] A modul...
...callable objects called kind objects. Each int or floating kind object f has the signature result = f(x), and each complex kind object has the signature result = f(x, y=0.). int_kind(n) For an integer argument n >= 1, return a callable object whose result is an integer kind that will hold an integer number in the open interval (-10**n, 10**n). The kind object accepts arguments that are integers including longs. If n == 0, returns the kind object corresponding to the Python literal 0. floa...
...callable: The called object PyObject *const *args: A vector of arguments size_t nargs: The number of arguments plus the optional flag PY_VECTORCALL_ARGUMENTS_OFFSET (see below) PyObject *kwnames: Either NULL or a tuple with the names of the keyword arguments This is implemented by the function pointer type: typedef PyObject *(*vectorcallfunc)(PyObject *callable, PyObject *const *args, size_t nargs, PyObject *kwnames); Changes to the PyTypeObject struct The unused slot printfunc tp_print is re...
...callable> <name> <tuple>: <block> is translated into the assignment: <name> = <callable>("<name>", <tuple>, <namespace>) where <namespace> is the dict created by executing <block>. This is mostly syntactic sugar for: class <name> <tuple>: __metaclass__ = <callable> <block> and is intended to help more clearly express the intent of the statement when something other than a class is being create...
...callable" to mean "a function, a method, or an instance with a __call__ method". It is up to the server, gateway, or application implementing the application callable to choose the appropriate implementation technique for their needs. Conversely, a server, gateway, or application that is invoking a callable must not have any dependency on what kind of callable was provided to it. Application callables are only to be called, not introspected upon. The Application/Framework Side The application...
...Callable Type Syntax</title><link>https://www.python.org/dev/peps/pep-0677/</link><description>This PEP introduces a concise and friendly syntax for callable types, supporting the same functionality as typing.Callable but with an arrow syntax inspired by the syntax for typed function signatures. This allows types like Callable[[int, str], bool] to be written as (int, str) -> bool.</description><author>Steven Troxler <steven.troxler@gmail.com&...
...Callable Frameworks expecting callback functions of specific signatures might be type hinted using Callable[[Arg1Type, Arg2Type], ReturnType]. Examples: from typing import Callable def feeder(get_next_item: Callable[[], str]) -> None: # Body def async_query(on_success: Callable[[int], None], on_error: Callable[[int, Exception], None]) -> None: # Body It is possible to declare the return type of a callable without specifying the call signature by substituting a l...
...callable object. The function implements the following algorithm: If the object is not callable - raise a TypeError If the object has a __signature__ attribute and if it is not None - return it If it has a __wrapped__ attribute, return signature(object.__wrapped__) If the object is an instance of FunctionType, construct and return a new Signature for it If the object is a bound method, construct and return a new Signature object, with its first parameter (usually self or cls) removed. (classme...
...callable will be used. If it is an actual callable it will be used directly - otherwise, if you specify a string (as in the example) the actual callable will be located using normal import mechanisms. The callable will be called with the remaining items in the configuration sub-dictionary as keyword arguments. In the above example, the formatter with id custom will be assumed to be returned by the call: my.package.customFormatterFactory(bar='baz', spam=99.9, answer=42) The key '()' has been u...