交作业，我用归递咋不行啊

Discuss / Python / 交作业，我用归递咋不行啊

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#1 Created at ... [Delete] [Delete and Lock User]

if len(s)==0 :
    return s
elif s[0]=='' :
    return trim(s[1:])
elif s[-1]=='' :
    return trim(s[:-1])
else :
    return s

我的归递咋不行啊？

#2 Created at ... [Delete] [Delete and Lock User]

终于弄清楚了，把空格符忘了加上。

#3 Created at ... [Delete] [Delete and Lock User]

我用你的方法，怎么测试是失败的呢？

#4 Created at ... [Delete] [Delete and Lock User]

这怎么行？

#5 Created at ... [Delete] [Delete and Lock User]

elif s[-1] == ' ': return trim(s[:-1])

这行代码不明白，为什么是取最后一位呢？不是应该最后第二位吗？