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  1. def trim(s):
  2.     if s=='':
  3.         return('')
  4.     elif s[0]==' ':
  5.         return trim(s[1:])
  6.     elif s[-1]==' ':
  7.         return trim(s[:-1])
  8.     return s
  9.  
  10.  
  11.  
  12. # 测试:
  13. if trim('hello  ') != 'hello':
  14.     print('测试失败!')
  15. elif trim('  hello') != 'hello':
  16.     print('测试失败!')
  17. elif trim('  hello  ') != 'hello':
  18.     print('测试失败!')
  19. elif trim('  hello  world  ') != 'hello  world':
  20.     print('测试失败!')
  21. elif trim('') != '':
  22.     print('测试失败!')
  23. elif trim('    ') != '':
  24.     print('测试失败!')
  25. else:
  26.     print('测试成功!')
  27.  
Success #stdin #stdout 0.11s 14164KB
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stdin
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Standard input is empty
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测试成功!
https://ideone.com/5gvYfd
language:
Python 3 (python  3.12)
created:
9 days ago
visibility:
public

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