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期末急救包——Python(B) 第一辑

  • 2026-07-02 16:39:19
期末急救包——Python(B) 第一辑
大家好呀，又到了一学期一次惊心动魄的期末月，可能大多数同学对Python这门课程还没怎么学，不知怎么复习。那么借此契机我们来共同复习/女娲补天。主播并非正经cs科班出身，只是简单谈谈对python的学习经验，主要还是啃高中的老本，若有谬误恳请海涵！
这一节课我们将讲解一些基础知识，暂时不涉及具体的程序设计。
一、py中的字符类型
我们需要注意的是
（1）、不同数值之间无法比较大小
（2）、使用input时输入时统一作为字符串类型输入，常常需要进行字符转换。转换方法举例如下：
times=int(input())
此时，原本的字符串就被int（）转化为了整数型，从''8''转化为了8。我们稍后介绍具体的转换词
（3）、运算时如果报错记得检查是否已经转化为了数值类型，别让字符串做加减法
二、变量与赋值的碎碎念
py是一个变量的世界，有无尽的变量的缠斗...
变量和变量名就如同个人与姓名的关系，一个变量对应一个变量名。而这个取名过程就是变量的赋值。
但是，变量名不可以随便取。有一些基本的原则与特例。
首先是原则。主要就两条：数字不能为首字符和变量名区分大小写字母，例如loser和LOSER是两个不一样的变量。
至于特例，就是我们不能给变量起什么名字：
这些都是我们的常用语句，另外，我在写的时候比较喜欢用str来当字符串名，但是并不建议。
变量取名务必要让人能看懂，至少你自己不会混淆诸变量的含义。
三、一个完整程序的流程是怎样的？
input—process—print
关于input和print的一些常见写法，我们暂时不涉及，大概在第三辑讲到。
process一般就是主程序，但是可能会涉及到调用已经定义的函数，相当于一个小小的插件。
四、# 注释
我个人习惯把提示和要求复制粘贴到右边的设计框便于快速阅读和修正，此时我们就可以使用 # 号来让程序知道这里可以不用运行
好的，本期的急救就到这里。贪多嚼不烂，希望对大家有所帮助!
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

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  1. CONNECT:[ UseTime:0.000373s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000580s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000242s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000578s ]
  6. SELECT * FROM `set` [ RunTime:0.000244s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000558s ]
  8. SELECT * FROM `article` WHERE `id` = 495467 LIMIT 1 [ RunTime:0.036070s ]
  9. UPDATE `article` SET `lasttime` = 1783042774 WHERE `id` = 495467 [ RunTime:0.003188s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000290s ]
  11. SELECT * FROM `article` WHERE `id` < 495467 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002953s ]
  12. SELECT * FROM `article` WHERE `id` > 495467 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.013609s ]
  13. SELECT * FROM `article` WHERE `id` < 495467 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010034s ]
  14. SELECT * FROM `article` WHERE `id` < 495467 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004468s ]
  15. SELECT * FROM `article` WHERE `id` < 495467 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003201s ]
0.151358s