实验5 文件应用编程

task3

 1 with open('实验5/data3.txt', 'r+', encoding = 'utf-8')as f:
 2     data = f.readlines()
 3     f.seek(0)
 4     f.truncate()        #使用truncate()清除文件中所有内容
 5 
 6     data1 = []
 7     for i in range(len(data)):
 8         data[i] = data[i].rstrip('\n')
 9         if i ==0:
10             data1.append('四舍五入后的数据')
11         else:
12             if (float(data[i]) * 10) % 10 >= 5:
13                 x = int(float(data[i])) + 1
14             else:
15                 x = int(float(data[i]))
16             data1.append(x)
17         f.writelines(f'{data[i]: <10}\t{data1[i]: <10}\n')
18     
19 data.pop(0)
20 data1.pop(0)
21 print(f'原始数据：\n{data}')
22 print(f'四舍五入后的数据：\n{data1}')

 

 

 
task4

 1 with open('实验5/data4.txt', 'r', encoding='utf-8')as f:
 2     data = f.readlines()
 3 
 4 for i in range(len(data)):
 5     data[i] = data[i].split('\t')
 6 x = data.pop(0)
 7 data.sort(key=lambda ele:ele[3],reverse=True)
 8 data.sort(key=lambda ele:ele[2])
 9 #先根据第4个元素排序，再根据第3个元素排序
10 data = [x] + data       #将x作为一个元素加入data
11 
12 with open('实验5/data4_processed.txt', 'w+', encoding='utf-8')as f:
13     for i in range(len(data)):
14         f.writelines('\t'.join(data[i]) + '')
15     f.seek(0,0)
16     data1 = f.readlines()
17     print(''.join(data1))

 

 

 


task5

 1 with open('实验5/data5.txt', 'r', encoding='utf-8')as f:
 2     data = f.readlines()
 3 
 4 data_str = ''.join(data)
 5 line_number = len(data)
 6 word_number = len(data_str.split())
 7 space_number = data_str.count(' ')
 8 chars_number = len(data_str)
 9 print(f'行数：{line_number}')
10 print(f'单词数：{word_number}')
11 print(f'空格数：{space_number}')
12 print(f'字符数：{chars_number}')
13 
14 with open('实验5/data5_with_line.txt', 'w', encoding='utf-8')as f:
15     for i in range(len(data)):
16         data[i] = str(i+1)+'\t'+data[i]
17     f.writelines(''.join(data))

 

 

 

 

posted @ 2022-05-15 11:09  Kyle-K  阅读(42)  评论(0)    收藏  举报