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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]

有个问题，为什么是s[-1:]不是s[-2:]呢？

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

看得太不仔细了……明白了