Python While
While 循环
使用 while 循环，只要条件为真，我们就可以执行一组语句。
注意: 记住要递增 i，否则循环会无限循环。
while 循环需要相关的变量准备就绪，在这个例子中，我们需要定义一个索引变量，i，我们将其设置为 1。
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