class Caesar:def _ _ init _ _(self):a = list(' abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ，。-!\ ' " ')b = a[3:]+a[:3]self . emap = dict(zip(a，b)) self.dmap = dict(zip(b，a)) def encode(self，text): tmp = [ (x in self.emap和self.emap[x]或x) for x in text ] return ' '。join(tmp) def decode(self，text): tmp = [ (x in self.dmap和self . dmap[x]or x)for x in text]return ' '。加入(tmp)
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