实验5 文件应用编程

Posted on 2022-05-12 11:41  灯下白头人  阅读(22)  评论(3)  编辑  收藏  举报

实验内容

实验任务1

略

实验任务2

略

实验任务3

 1 def task3():
 2     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验5数据文件/data3.txt"
 3               ,"r",encoding="utf-8") as f:
 4         title=f.readline()
 5         title=title.strip()
 6         datas=f.readlines()
 7         for i in range(len(datas)):
 8             datas[i]=eval(datas[i].strip())
 9              
10     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验5数据文件/data3_processed.txt"
11               ,"w+",encoding="utf-8") as f:
12         #print(f"{title}\t\t四舍五入后数据")
13         print("原始数据：\n",datas)#
14         datas_2=[]#
15         f.write(f"{title}\t\t四舍五入后数据\n")
16         for i in datas:
17             if i%1>=0.5:
18                 #print(f"{i}\t\t{int(i+1)}")
19                 datas_2.append(int(i+1))#
20                 f.write("{0}\t\t{1}\n".format(i,int(i+1)))
21             else:
22                 #print(f"{i}\t\t{int(i)}")
23                 datas_2.append(int(i))#
24                 f.write("{0}\t\t{1}\n".format(i,int(i)))
25         print("四舍五入后数据：\n",datas_2)#

*将后面带#的行用注释行替换即可以文件内样式输出。

实验任务4

 1 def task4():
 2     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验5数据文件/data4.txt"
 3               ,"r",encoding="utf-8") as f:
 4         titles=f.readline()
 5         titles=titles.split()
 6         datas_s=f.read().split()
 7         dataarray=[[],[],[],[]]
 8         for i in range(len(datas_s)):
 9             if i%4==0:
10                 dataarray[0].append(datas_s[i])
11             elif i%4==1:
12                 dataarray[1].append(datas_s[i])
13             elif i%4==2:
14                 dataarray[2].append(datas_s[i])
15             elif i%4==3:
16                 dataarray[3].append(datas_s[i])
17         datas=[]
18         for i in range(len(dataarray[0])):
19             data=[]
20             for j in range(4):
21                 data.append(dataarray[j][i])
22             datas.append(data)
23     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验5数据文件/data4_processed.txt"
24               ,"w+",encoding="utf-8") as f:
25         for i in range(len(datas)):
26             for j in range(i+1,len(datas)):
27                 if datas[i][2]>datas[j][2]:
28                     datas[i],datas[j]=datas[j],datas[i]
29         for i in range(len(datas)):
30             if datas[i][2]!=datas[i+1][2]:
31                 n=i+1;break
32         for i in range(n):
33             for j in range(i,n):
34                 if datas[i][3]<datas[j][3]:
35                     datas[i],datas[j]=datas[j],datas[i]
36         for i in range(n,len(datas)):
37             for j in range(i,len(datas)):
38                 if datas[i][3]<datas[j][3]:
39                     datas[i],datas[j]=datas[j],datas[i]
40 
41         print("\t".join(titles))
42         f.write("\t".join(titles)+"\n")
43         for i in range(len(datas)):
44             print("\t".join(datas[i]))
45             f.write("\t".join(datas[i])+"\n")

*使用numpy库可大幅缩减代码行数。但容易出错。

实验任务5

 1 def task5():
 2     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验5数据文件/data5.txt"
 3               ,"r",encoding="utf-8") as f:
 4         text=f.read()
 5         chars=0;spaces=0;lines=1;words=0
 6         for i in range(len(text)-1):
 7             chars+=1
 8             if text[i]=="\n":
 9                 lines+=1
10             elif text[i]==" ":
11                 spaces+=1
12             elif text[i].isalpha() and not(text[i+1].isalpha()) and not(text[i+1]=="'"):
13                 words+=1
14         chars+=1
15         print(f"行数：{lines}\n单词数：{words}\n空格数：{spaces}\n字符数：{chars}")
16 
17         f.seek(0)
18         lines=f.readlines()
19         
20     with open("/Users/chenxi/Documents/文稿 - 陈曦的MacBook Air - 1/python data/实验5数据文件/data5_with_line.txt"
21               ,"w+",encoding="utf-8") as f:
22         i=1
23         for line in lines:
24             f.write("{0} {1}".format(i,line))
25             i+=1

*用计算器数过，单词数143无误。答案可能有误。