“typed=False”是什么意思？

Question

I'm looking at the (presumably) built-in module called "typing.py", and I'm trying to understand what's going on in there. I'm specifically looking at the code below, where we see an input argument called "typed=False". What does that even mean?

As I understand it, "func=None" appears to mean "no function is allowed in the inputs" (correct me if I'm wrong), where "func" refers to the object-type "function" (which presumably most programmers are familiar with because it's a basic concept). But what about "typed=False"?

def _tp_cache(func=None, /, *, typed=False):
    """Internal wrapper caching __getitem__ of generic types with a fallback to
    original function for non-hashable arguments.
    """
    def decorator(func):
        cached = functools.lru_cache(typed=typed)(func)
        _cleanups.append(cached.cache_clear)

        @functools.wraps(func)
        def inner(*args, **kwds):
            try:
                return cached(*args, **kwds)
            except TypeError:
                pass  # All real errors (not unhashable args) are raised below.
            return func(*args, **kwds)
        return inner

    if func is not None:
        return decorator(func)

    return decorator

Answer 1

As I understand it, "func=None" appears to mean "no function is allowed in the inputs" (correct me if I'm wrong), where "func" refers to the object-type "function" (which presumably most programmers are familiar with because it's a basic concept). But what about "typed=False"?

None of that is correct.

func is a parameter name, not a type. =None means that it defaults to None if no value is provided. typed is another parameter name; =False means it defaults to False . The * and / in the parameters list indicate that func is a positional parameter (ie it's always just the first argument, the caller doesn't need to say func= ) and typed is a keyword argument (ie it must always be specified as typed=SOMETHING by the caller).

Trying to understand Python code without having a basic understanding of Python syntax is going to be extremely difficult; it's not something that you can guess at as you've attempted to do here, especially if you're diving straight into decorator (higher-order) functions, which are a relatively advanced feature and require that you already have a very firm grasp of how basic functions work.

I recommend making your way through a Python tutorial, eg https://docs.python.org/3/tutorial/ .