typetestdeco.py

# Decorator
def checkparams(*checkers):
    def _deco_(fun):
        def _wrapped_(*args):
            print("I check {} params".format(fun.__name__))
            assert all(f(v) for f,v in zip(checkers, args))
            return fun(*args)
        return _wrapped_
    return _deco_

# Type checking function factory
checktype = lambda t: lambda v: isinstance(v, t)

@checkparams(checktype(int), checktype(str), checktype(float))
def foo(a, b, c):
    print(":D")

foo(42, "foo", 13.37)
foo(13.37, 42, "foo")