非独立思考的作业

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

while s[:1] == ' ':

s = s[1:]

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

s = s[:-1]

return s

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

厉害了，万万没想到能写怎么简

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

牛逼啊，这个写法真的好赞

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

要是有两个空格就要出错了

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

看错了，原来是带循环的，这个写法简单，就是每次都开辟新的内存空间存s

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

写法很好，但是每次都做了字符串的复制操作，耗cpu耗内存，其实只要记录头尾位置就行，最后再一个切片操作