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Python程序设计课程记录(一)

  • 2026-04-16 03:42:00
Python程序设计课程记录(一)

一、Python基本使用方法

'''1.标识符:字母或字母、数字、特殊字符等组合形成的字符,比如a,ab,a123,tf,ab_44,at_tt''''''2.关键字:编程环境中有特殊意义的字符标识符和关键字,不能相同,比如:for,break,if,else,in,……''''''3.变量:用于定义或存储数据的标识符名称每个变量有一个唯一的标识符''''''4.编程之问:我们为什么要编程?--解决实际问题。实际问题中,有大量的数据,比如:1)数值数据:比如2.2,32)文本数据:比如人民,congding这些数据在Python编程环境中如何存储起来?---通过变量来存储'''num_int=2num_float=2.6string1='人民'string2="congding"

二、Python基本数据类型与数据结构

面对众多的数据(数值、文本等),如何有效地进行储存呢?何为有效?---方便存、方便取、还方便修改和拓展

list_2=['张','明','P','y','t','h','o','课','程','成','绩',95#列表t_1=('张','明','P','y','t','h','o','课','程','成','绩',95)  #元组dict_1={'姓名':'张明','课程':'Python','成绩':95#字典s_1={'张','明','P','y','t','t'#集合
如何从定义好的数据结构(或称数据容器)中把数据提取出来呢。基本思路是:数据结果变量名[标识],-------其中标识为索引或键
r1=dict_1['成绩']r2=list_2[9]r3=t_1[2]print('r1=',r1)print('r2=',r2)print(dict_1['成绩'])
r1= 95r2= 成95

如何修改数据结构中的元素值呢:数据结构变量名[标识]=修改的值。

dict_1['成绩']=98list_2[11]=100t_1[11]=50  #报错,因为元组具有写保护的功能,不允许数据进行修改

小实践练习:

今有4个同学成绩单,如下:小红,语文,89小李,数学,80小张,英语,95小黄,物理,801)请用学习过的知识,通过定义数据结构,将这些数据存储起来2)小红和小黄的成绩录错了,分别为99分和87分,请修改3)通过print函数,输出所有同学的科目成绩

三、for循环的基本概念与数据获取

for i in 数据结构:    i---循环变量
list_2=['张','明','P','y','t','h','o','课','程','成','绩',95]  #列表k=0for value in list_2:    k=k+1    print('k=',k,'元素值=',value)
k1 元素值= 张k2 元素值= 明k3 元素值= Pk4 元素值= yk5 元素值= tk6 元素值= hk7 元素值= ok8 元素值= 课k9 元素值= 程k10 元素值= 成k11 元素值= 绩k12 元素值= 95

for value in list_2这个循环语句,value是循环变量,这个变量的值是动态变化的,按顺序从list_2中依次(循环)取出来并赋给value,当取完最后一个元素的时候,循环结束。第4、5行为for循环体里的语句,左边对齐缩进。循环体中的语句,即循环(重复)执行的动作,虽然这个动作是循环(重复)执行的,而且执行的逻辑也是一样的,但是每次执行的时候,value值是不同的。正是因为执行逻辑相同,而循环变量的不同,从而解决了很多重复性的问题。

k=0for i in [0,1,2,3,4,5,6,7,8,9,10,11]:  k=k+1  print('k=',k,'元素值=',list_2[i])

以上的循环执行结果是一样的,但是循环变量不一样。但是思路是一样的,这里循环变量为i,它的值也是从[0,1,2,3,4,5,6,7,8,9,10,11]依次(循环)取出来,并赋给i的。这里的i,作为list_2的索引,在循环体中依次把list_2中的元素输出来。

k=0for i in range(12):    k=k+1    print('k=',k,'元素值=',list_2[i])

这个程序段,则用range(12)代替了[0,1,2,3,4,5,6,7,8,9,10,11],效果是一样的。range(12)的完整写法是range(0,12,1),产生的是区间为[0,12),步长为1的整数。

list(range(12))
可以通过以上命令,转化为列表来查看。
Out[1]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

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  1. CONNECT:[ UseTime:0.001025s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001526s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002311s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000694s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001544s ]
  6. SELECT * FROM `set` [ RunTime:0.000759s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001780s ]
  8. SELECT * FROM `article` WHERE `id` = 485548 LIMIT 1 [ RunTime:0.005335s ]
  9. UPDATE `article` SET `lasttime` = 1776356340 WHERE `id` = 485548 [ RunTime:0.001547s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000725s ]
  11. SELECT * FROM `article` WHERE `id` < 485548 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009124s ]
  12. SELECT * FROM `article` WHERE `id` > 485548 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001249s ]
  13. SELECT * FROM `article` WHERE `id` < 485548 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010740s ]
  14. SELECT * FROM `article` WHERE `id` < 485548 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002244s ]
  15. SELECT * FROM `article` WHERE `id` < 485548 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002307s ]
0.233307s