Python 字符串是数组
字符串是数组
像许多其他流行的编程语言一样，Python 中的字符串是表示 Unicode 字符的字节数组。
但是，Python 没有字符数据类型，单个字符只是一个长度为 1 的字符串。
可以使用方括号访问字符串中的元素。
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