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切片

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13个望辰

#1 Created at ... [Delete] [Delete and Lock User] 
def trim(s):
  if len(s)==0 or s.isspace():
    s=''

  else:
    while s[0]==' ':
      s=s[1:]

    while s[-1]==' ':
      s=s[:-2]    
  return s

13个望辰

#2 Created at ... [Delete] [Delete and Lock User] 
错了，下面应该是s[:-1]，这个命令是切取第一个到倒数第二个
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