Python字符串处理实现单词反转

import redef reserve(str_list, start, end):  while start <= end:    str_list[start], str_list[end] = str_list[end], str_list[start]    end -= 1    start += 1str = ' I love china!  'str_list = list(str)print(str_list)i = 0print(len(str_list))# 从前往后遍历list，如果碰到空格，就调用反转函数，不考虑单个字符情况while i < len(str_list):  if str_list[i] != ' ':    start = i    end = start + 1    print(end)    while (end < len(str_list)) and (str_list[end]!=' '):      end += 1    if end - start > 1:      reserve(str_list, start, end-1)      i = end    else:      i = end  else:    i += 1print(str_list)str_list.reverse()print(''.join(str_list))# 采用正则表达式操作str_re = re.split(r'(/s+)',str)str_re.reverse()str_re = ''.join(str_re)print(str_re)