实验5 文件应用编程

task6.py

 1 with open('data6.csv','r',encoding='gbk')as f:
 2     data=list(f.readlines())
 3 data=[i.strip('\n') for i in data ]
 4 
 5 import decimal
 6 decimal.getcontext().rounding='ROUND_HALF_UP'
 7 title=[data[0],'四舍五入后的数据']
 8 data_new=[]
 9 data_o=[]
10 for i in data:
11     if not i.isalpha() is True:
12         data_o.append(eval(i))
13 print('原始数据：')
14 print(data_o)
15 for i in data:
16     if not i.isalpha() is True:
17         data_new.append([i])
18 
19 data_=[]
20 for i in data:
21     if not i.isalpha() is True:
22         index=data.index(i)-1
23         i=eval(i)
24         if i-int(i)>=0.5:
25             i=int(i)+1
26             data_new[index].append(str(i))
27             data_.append(i)
28         else:
29             i=int(i)
30             data_new[index].append(str(i))
31             data_.append(i)
32 print('四舍五入后的数据:')
33 print(data_)
34 import csv
35 with open('data6_after.csv','w',encoding='gbk',newline='') as f :
36     f_writer=csv.writer(f)
37     f_writer.writerow(title)
38     f_writer.writerows(data_new)

运行结果：

task7.py

 1 with open('data7.csv','r',encoding='gbk') as f:
 2     data1 = f.read().split('\n')
 3 del data1[0]
 4 lsta = []
 5 lstb = []
 6 for i in data1:
 7     lst1 = i.split(',')
 8     if lst1[2] == 'Acting':
 9         lsta.append(lst1)
10     else:
11         lstb.append(lst1)
12 lstb.sort(key=lambda x:x[-1],reverse = True)
13 lsta.sort(key=lambda x:x[-1],reverse = True)
14 info = lsta + lstb
15 title = ['学号','姓名','专业','分数']
16 with open('data7_processed.csv','w',encoding='gbk') as f:
17     f.write(','.join(title)+'\n')
18     for items in info:
19         f.write(','.join(items)+'\n')
20 print('{:<10}'.format(title[0]),'{:<10}'.format(title[1]),'{:<10}'.format(title[2]),'{:<15}'.format(title[3]))
21 for i in info:
22     print('{:<10}'.format(i[0]),'{:<10}'.format(i[1]),'{:<10}'.format(i[2]),'{:<15}'.format(i[3]))

运行结果：

task8.py

 1 with open('hamlet.txt', 'r', encoding='utf-8') as f:
 2     data = f.read()
 3 
 4 print('hamlet.txt粗略统计：')
 5 print(f'行数：{len(data.splitlines())}')
 6 print(f'单词数：{len(data.split())}')
 7 print(f'字符数：{len(data)}')
 8 print(f'空格数：{data.count(" ")}')
 9 
10 data1 = data.splitlines()
11 with open('hamlet_with_line_number.txt', 'w', encoding='utf-8') as f:
12     for number, words in enumerate(data1, 1):
13         f.write(f'{number}  {words}\n')

运行结果：

task9.py

 1 with open('data9_id.txt','r',encoding='utf-8')as f:
 2     data=f.readlines()
 3 
 4 info=[line.strip('\n').split(',')for line in data]
 5 del info[0]
 6 
 7 def is_valid(id):
 8     y=id[:17]
 9     if (i in ['1','2','3','4','5','6','7','8','9','0','X'] for i in id) and len(id)==18 and y.isdigit() and (id[17]=='X' or id[17].isdigit()):
10         return True
11     else:
12         return False
13 print('{:<10} {:<10} {:<10} '.format('姓名','出生日期','年龄'))
14 import datetime
15 today=datetime.date.today()
16 valid_ls=[]
17 for ls in info:
18     if is_valid(ls[1]) is True:
19         y, m, d = ls[1][6:10], ls[1][10:12], ls[1][12:14]
20         birth = y + '-' + m + '-' + d
21         ls.append(birth)
22         del ls[1]
23         birthday=datetime.date(year=int(y),month=int(m),day=int(d))
24         age=str(round((today-birthday).days/365))
25         ls.append(age)
26         valid_ls.append(ls)
27 def takeThird(elem):
28     return elem[2]
29 valid_ls.sort(key=takeThird,reverse = True)
30 for ls in valid_ls:
31     for i in ls:
32         print('{:8}'.format(i),end='    ')
33     print()

运行结果：

task10.1.py

 1 import datetime
 2 t = datetime.datetime.now()
 3 filename = t.strftime('%Y%m%d') + '.txt'
 4 n=eval(input('输入随机抽取人数：'))
 5 with open('data10_stu.txt', 'r', encoding = 'utf-8') as f:
 6     data=f.readlines()
 7 
 8 def random_selection(n):
 9     import random
10     demo = random.sample(data, n)
11     return demo
12 x=random_selection(n)
13 for i in x :
14     print(i)
15 
16 with open(filename,'w',encoding='utf-8')as f:
17     f.writelines(x)

运行结果：

task10.2.py

 1 import random
 2 import datetime
 3 t = datetime.datetime.now()
 4 title = t.strftime('%Y%m%d')
 5 
 6 with open('data10_stu.txt', 'r', encoding='utf-8') as f:
 7     data = f.readlines()
 8 data0 = [i.strip('\n').split('\t') for i in data]
 9 
10 print(f'{"抽点开始":*^40}')
11 n = eval(input('输入随机抽点人数:'))
12 
13 a = 0
14 while n != 0:
15     data1 = random.sample(data0, n)
16     a += 1
17     for i in data1:
18         print('  '.join(i))
19         data0.remove(i)
20     if a == 1:
21         with open(f'{title}.txt', 'w', encoding='utf-8') as f:
22             for i in data1:
23                 f.write(f'{i[0]}\t{i[1]:6s}\t{i[2]:10s}\n')
24     else:
25         with open(f'{title}.txt', 'a', encoding='utf-8') as f:
26             for i in data1:
27                 f.write(f'{i[0]}\t{i[1]:6s}\t{i[2]:10s}\n')
28     n = eval(input('输入随机抽点人数:'))
29 print(f'{"抽点结束":*^40}')

运行结果：