调了半小时，感觉这个比较简洁，分析给大家
Topic source
def trim(s):
if len(s)==0:
s=''
elif s[0] ==' ':
s =trim(s[1:])
elif s[-1] == ' ':
s = trim(s[:-1])
return s
if trim('hello ') != 'hello': print('测试失败!') elif trim(' hello') != 'hello': print('测试失败!') elif trim(' hello ') != 'hello': print('测试失败!') elif trim(' hello world ') != 'hello world': print('测试失败!')
elif trim(' ') != '':
print('测试失败!')
elif trim('') != '': print('测试失败!') else: print('测试成功!')
- 1
爱吃红薯的小雨安
def trim(s): if s[0] == ' ': s =trim(s[1:]) elif s[-1] == ' ': s = trim(s[:-1]) return s