def typecheck(*tuples, **kwtuples):
def decorator(func):
    def function_wrapper(*args, **kwargs):

        #print('tuples : ' , tuples)
        #print('kwtuples : ' , kwtuples)
        #print('args : ' , args)
        #print('kwargs : ' , kwargs)

        for index, tup in enumerate(tuples):
            arg = args[index]
            if not isinstance(arg, tup):
                raise ValueError('in ' + str(func.__name__) + ' : wrong argument on position ,' + str(index) + ' :'  + str(arg) + ' must be of type :' + str(tup) + 'but is' + str(type(arg)) )

        for key, tup in kwtuples.items():
            arg = kwargs[key]
            if not isinstance(args[index], tup):
                raise ValueError('in ' + str(func.__name__) + ' : wrong argument ' + str(key) + ' :'  + str(arg) + ' must be of type :' + str(tup) + 'but is' + str(type(arg)) )




    #print("arguments: ", *args, **kwargs)
        func(*args, **kwargs)
    return function_wrapper
return decorator

@typecheck(str,(str, float))
def foo2(x,y):
    print("Hi, foo has been called with ",str(x) ,y)

foo2('2',3.4)