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原标题:Python type hinting a deque filled with myclass objects
using Python 3.6 or newer, I want to type hint a function myfunc that returns an object of MyClass. How can I hint, that myqueue is a deque filled with MyClass objects? from collections import deque global_queue = deque() class MyClass: pass def myfunc(myqueue=global_queue) -> MyClass: return myqueue.popleft() for i in range(10): global_queue.append(MyClass())
最佳回答
In Python 3.9, you can use deque[ MyClass ]() directly. If you are using Python 3.6.1 or higher, you can use typing.Deque: from typing import Deque from collections import deque global_queue: Deque[ MyClass ] = deque() class MyClass: pass def myfunc(myqueue: Deque[MyClass] = global_queue) -> MyClass: return myqueue.popleft() for i in range(10): global_queue.append(MyClass()) Alternatively, you can do global_queue = Deque[ MyClass ]() instead -- at runtime, that ll construct a collections.deque object. If you need to support Python 3.5, install the typing_extensions 3rd party library and do from typing_extensions import Deque. That library contains backports of types that were added after the typing module was first added to the standard library.
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