[Python] How to write @NotNull decorator better?

Question

The actual phenomenon of @NotNull, @Nullable (by jetbrains) in Java: https://www.jetbrains.com/hel... It can be implemented using decorators in Python, but no fine-grained control has been found yet: https:// www.google.com/search... The expected phenomenon would like to provide a detailed...

習慣沉默 · Answer

from functools import wraps
def allow_jsonp(fun):
    @wraps(fun)
    def wrapper_fun(*args, **kwargs):
        for a in args:
            if not a:
                return 'args is null'
        return fun(*args, **kwargs)
    return wrapper_fun

@allow_jsonp
def a(a):
    print (111111111)

print (a(0))

PHP中文网 · Answer

from functools import wraps

def not_none(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        if (None in args) or (None in kwargs.values()):
            raise ValueError('Arguments must be not None')
        else:
            return func(*args, **kwargs)
    return wrapper

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