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认识Python基础语法(1)

  • 2026-08-20 10:12:09
认识Python基础语法(1)
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一些唠叨:
和大学学到的C语言一样,Python也是一种编程语言,也有自己的基础语法,只不过它语法简单,学起来会更容易。学会电脑的语言,才能给电脑下达指令,才能真正的使用电脑帮助你学习和工作。加油~
提示:pycharm窗口的所有案例请大家自己动手操作,更好的理解语法

一、注释与print

1.注释:方便自己或他人看懂程序,python会直接忽略,不会执行。
单行注释:#后面同一行的文字都是注释的内容
多行注释:
"""
第一行
第二行
第三行等等
"""
2.print :即输出,把内容展示在控制台窗口。print(内容) 就是告诉程序:把括号里的东西显示出来。
文字等字符串要加单双引号,数字不需要。一行可以输出多个内容,用逗号隔开,输出是显示空格。
注释下面的运行没有输出任何内容。编程界面和运行界面对照着看,认识该编程语言。

二、五大基础数据类型、type函数

1.五大基础数据

int:整数,正负数,0,没有小数点
float:浮点数,即小数,带小数点
str:字符串,所有文本,中文,英文,符号,划重点,必须引号包裹,也可以这么理解,所有带引号的数据都是字符串
bool:布尔类型,只有两个值,True,Flase,用于条件判断
None:空值,表示什么都没有,不是0也不是空字符串,代表无,不存在,无结果,未赋值。主要用在提前定义一个变量,但暂时不知道存什么数据,先用None占位置,占位初始化等等。

2.type

type(变量名/数据),查看数据类型
下方运行输出数据类型。

三、变量赋值和交换

1.变量赋值

主要作用:
在一段数据反复使用时,赋予该数据变量名,后续直接调用变量名,可不用重复书写;
修改数据的时候只需要修改一处数据值,所有引用位置跟着变。
划重点!!变量名=数据值
注:变量名只能以字母、数字和下划线组成,数字不能开头,严格区分大小写,不能使用关键字,如if,while等等。

2.变量交换

要交换数据值,可以借助第三方临时变量;(几乎所有的语言都能用。)
也可以直接解包交换,在python语言下才可行,即一行完成变量的交换,即a,b=b,a。(python简便的地方)
这样一看,写了这么多的代码,只是输出了这么简单的内容。学的更多的时候,学会用更简单的语言让计算机理解你的意思。那便是在制定规则,让别人跟着你的rule来操作,既简单逻辑又强的语言会胜出。

四、练习

1.定义五个变量,分别对应 5 种基础数据类型:
字符串:家乡 、整数:出生年份 、浮点数:身高 、布尔值:是否结婚 、空值:备用变量 null_var
2.使用print()搭配type(),逐行打印每个变量的值和对应数据类型;
3.定义两个变量 a=77、b=99,先用临时变量法交换,打印交换结果; 重新赋值 a=77、b=99,再用 Python 简写 a,b = b,a 交换,打印结果。
4.写出 3 个非法变量名,并分别说明报错原因; 辨析:num = "77" 和 num = 77 二者区别,用 type 打印对比类型。

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  1. CONNECT:[ UseTime:0.000974s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001815s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000734s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000814s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.002023s ]
  6. SELECT * FROM `set` [ RunTime:0.003488s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001642s ]
  8. SELECT * FROM `article` WHERE `id` = 506898 LIMIT 1 [ RunTime:0.001145s ]
  9. UPDATE `article` SET `lasttime` = 1787316912 WHERE `id` = 506898 [ RunTime:0.004378s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000837s ]
  11. SELECT * FROM `article` WHERE `id` < 506898 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002691s ]
  12. SELECT * FROM `article` WHERE `id` > 506898 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001334s ]
  13. SELECT * FROM `article` WHERE `id` < 506898 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002581s ]
  14. SELECT * FROM `article` WHERE `id` < 506898 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.060195s ]
  15. SELECT * FROM `article` WHERE `id` < 506898 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.101379s ]
0.367136s