Bare bones type checking for function

Type check

from functools import wraps

class Boat(object):

    def __init__(self,color):
        self.color = color
    
    def hello(self):
        print("I'm a {} boat".format(self.color))

def arg_check(typelist):
    def decorator(f):
        @wraps(f)
        def wrapper(*args, **kwds):
            for ii, typeitem in enumerate(typelist):
                assert(isinstance(args[ii],typeitem[1])),\
                        "{} is not {} for {}".format(args[ii] , typeitem[1],f)
            return f(*args, **kwds)
        return wrapper
    return decorator

@arg_check((('myarg1',str),("myarg2",int),("boat",Boat)))
def silly(myarg1,myarg2,boat):
    print(myarg1*myarg2)
    boat.hello()
    print("I'm done")

if __name__ == "__main__":
    print("HELLO WORLD")
    yacht = Boat("gray")
    silly("gravy",3,yacht)
    silly("gravy",3,"not a boat")