单词反转-----python

#交换两个元素
def reverce(str_list,start,end):
    while start < end:
        str_list[start],str_list[end] = str_list[end],str_list[start]
        start += 1
        end -= 1
sentence = ' hello, nice to meet you!  '
str_list = list(sentence)
i = 0
while i<len(str_list):
    if str_list[i]:
        start = i
        end = start+1
        while(end <len(str_list)and str_list[end]!=' '):
            end += 1
        reverce(str_list,start,end - 1)
        i = end
    else:
        i +=1
#先拆分后整合元素
str_list.reverse()
print(''.join(str_list))

运行结果：

you! meet to nice hello,