Python For 循环
Python 循环
for 循环用于迭代序列（列表、元组、字典、集合或字符串）。
这不像其他编程语言中的 for 关键字，更像是其他面向对象编程语言中的迭代器方法。
使用 for 循环，我们可以对列表、元组、集合等中的每个项目执行一组语句。
for 循环不需要预先设置索引变量。
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