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私はpythonが初めてなので、phpで次の操作を変換する必要があります。
if len (s) == 88: return s[48] + s[81:67: -1] + s[82] + s[66:62: -1] + s[85] + s[61:48 : -1] + s[67] + s[47:12: -1] + s[3] + s[11:3: -1] + s[2] + s[12]
この format の意味が正確にはわかりませんs[a:b: -c]。
s[a:b: -c]