实验6 文件应用编程-2

Posted on 2022-05-22 21:18  灯下白头人  阅读(57)  评论(1)  编辑  收藏  举报

实验内容

实验任务1，2，4，6依要求略。

实验任务3

 1 def task3():
 2     def is_valid(num):
 3         real=1
 4         for i in num:
 5             if not(("0"<=i<="9" or i=="X") and len(num)==18):
 6                 real=0;break
 7 
 8         if real:
 9             return True
10         else:
11             return False
12 
13     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验6数据文件/data3_id.txt", 'r', encoding="utf-8") as f:
14         title=f.readline()
15         datas=f.readlines()
16         data=[]
17         for i in datas:
18             i=i.rstrip().split(",")
19             if is_valid(i[1]):
20                 data.append((i[0],i[1]))
21 
22         print(data)
23         print(data[0][1])
24         
25         for i in range(len(data)):
26             for j in range(i+1,len(data)):
27                 if eval(data[i][1][6:14])>eval(data[j][1][6:14]):
28                     data[i],data[j]=data[j],data[i]
29         
30         for i in data:
31             print(f"{i[0]},{i[1][6:10]}-{i[1][10:12]}-{i[1][12:14]}")

运行截图

*此处排序算法为本人手写冒泡排序，结果与所给实验结果略有出入，示例应当使用了其他排序算法。

实验任务5

 1 def task5():
 2     import random
 3     import datetime
 4     
 5     n=eval(input("input roll call number:"))
 6     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验6数据文件/data5.txt"
 7               , "r" , encoding="utf-8") as f:
 8         datas=f.readlines()
 9         mem_num=random.sample(range(len(datas)),n)
10         for i in mem_num:
11             print(datas[i].strip()+"\n",end="")
12 
13     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验6数据文件/{0}.txt".format(datetime.datetime.now().strftime('%Y%m%d'))
14               ,"w+",encoding="utf-8") as f:
15         for i in mem_num:
16             f.write(datas[i].strip()+"\n")
17 
18 def task5_2():
19     import random
20     import datetime
21 
22     print(f"{'Roll call':=^50}")
23     
24     while True:
25         n=eval(input("input roll call number:"))
26         if n==0:
27             break
28         
29         with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验6数据文件/data5.txt"
30               , "r" , encoding="utf-8") as f:
31             datas=f.readlines()
32             mem_num=random.sample(range(len(datas)),n)
33             for i in mem_num:
34                 print(datas[i].strip()+"\n",end="")
35         
36         with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验6数据文件/{0}.txt".format(datetime.datetime.now().strftime('%Y%m%d'))
37               ,"w+",encoding="utf-8") as f:
38             for i in mem_num:
39                 f.write(datas[i].strip()+"\n")
40 
41     print(f"{'Over':=^50}")

运行截图

*

1.务必将数据处理干净，即使多费运行内存与时间！否则可能出现如图错误。

2.文件名处直接将函数作为参数代入，如实验4所写将文件名变量化将更清晰易读。