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contents/qa-string.md

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### 为什么是string.join(list)而不是list.join(string)
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问题 [链接](http://stackoverflow.com/questions/493819/python-join-why-is-it-string-joinlist-instead-of-list-joinstring)
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答案:
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因为所有可迭代对象都可以被连接,但是连接者总是字符串
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因为所有可迭代对象都可以被连接,而不只是列表,但是连接者总是字符串
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### 字符如何转为小写
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