字符串以单词形式反转

比如"what is your name"，反转成name your is what

str_new = ""
str = "what is your name"
str_list = str.split(' ')
print(str_list)
strnew_list = list(reversed(str_list))
print (strnew_list)
for i in strnew_list:
    str_new = str_new+i+" "
print (str_new)