python3带参数的装饰器 函数参数类型检查

from inspect import signature#python3才有的模块

def typeassert(*args,**kwargs):

    def decorator(fun):

        sig=signature(fun)

        btypes=sig.bind_partial(*args,**kwargs).arguments

        def wrapper(*funargs,**funkwargs):

            for name,stype in sig.bind_partial(*funargs,**funkwargs).arguments.items():

                if name in btypes:

                    if not isinstance(stype,btypes[name]):

                        raise TypeError("'%s' must be '%s'"%(name,btypes[name]))

            return fun(*funargs,**funkwargs)

        return wrapper

    return decorator

@typeassert(int,str)

def myFun(a,b):

    print(a,b)

myFun(,"")