Python-GoogleCourse 学习 Day2

参考 http://www.runoob.com/python/python-strings.html https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001431664106267f12e9bef7ee14cf6a8776a479bdec9b9000 https://www.b

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