大部分刚开始接触Python的人, 当看到for循环以及while循环的时候, 总会下意识地认为二者相差无几, 然而在实际去编写代码之际, 却又压根不清楚该如何做出选择, 实际上, 这两种循环各自具备着独特的适用情形, 一旦将其弄明白, 编写代码的效率便能够实现成倍增长。for循环到底用在什么地方“for循环”于Python里运用得最为频繁, 缘由在于它天生适配遍历序列。你持有一串数据, 诸如列表、字符串、元组乃至字典, “for循环”能够逐一取出予以处理。譬如你欲遍历一个列表里的各个数字, 计算其平方, “for循环”书写起来极为便利。并且Python的“for循环”不像C语言那般需手动操控索引, 它径直迭代元素, 代码看上去清爽许多。在实际工作当中, 处理文件, 解析数据, 批量操作API请求, 都会大量运用for循环。比如说, 你要是想从CSV文件里逐行读法内容, for循环与open函数配合就能轻松达成。好多人刚开始会觉得for循环只有在知道循环次数之际才能使用, 实则并非如此。遍历一个不清楚长度的列表, for循环仍然可以发挥作用。只要对象是能够迭代的, for循环就能够自动处理直至最后一项。有一点需格外留意: 于for循环之中, 切莫尝试去更改正在进行遍历的列表。比如说, 当你一边进行遍历一边实施删除元素的操作时, 索引将会变得混乱不堪, 最终的结果极易出现差错。要是确实存在修改的必要, 那么建议你先去复制一份列表, 或者借助列表推导式来生成新的列表。while循环在什么情况下更合适“条件驱动”是while循环的核心特点。只要条件是真的, 循环就会持续运行。这种机制适合适合那些循环次数不确定的场景。比如说你写一个猜数字游戏, 用户没猜对就继续进行猜测, 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