零基础入门学Python 第 30 讲 文件系统：介绍一个高大上的东西

黄金猫

注意:
1.需要用到字典,字典的用法需要多复习
2.需要用到递归,递归的用法要积累

1. 动动手:
   
2. 0.
   
3. import os
   
4. 
   
5. file_name = os.listdir('/Users/yufan/Documents/python编程/30/doc')
   
6. print(file_name)
   
7. 
   
8. txt = 0
   
9. png = 0
   
10. py = 0
    
11. docx = 0
    
12. doc = 0
    
13. 
    
14. for each_file in file_name:
    
15.     if '.txt' in each_file:
    
16.         txt += 1
    
17.     elif '.png' in each_file:
    
18.         png += 1
    
19.     elif '.py' in each_file:
    
20.         py += 1
    
21.     elif '.docx' in each_file:
    
22.         docx += 1
    
23.     elif '.' not in each_file:
    
24.         doc += 1
    
25. 
    
26. print('txt 是 %d, png 是 %d, py 是 %d, docx 是 %d, doc 是 %d' % (txt,png,py,docx,doc))
    
27. 
    
28. 1.
    
29. import os
    
30. doc_path = '/Users/yufan/Documents/python编程/30'
    
31. file_name = os.listdir(doc_path)
    
32. 
    
33. file_path = []
    
34. 
    
35. for each_file_name in file_name:
    
36.     file_path.append(os.path.join(doc_path,each_file_name))
    
37. 
    
38. for each_file in file_path:
    
39.     print('文件 %s 的大小是 %d byte.' % (os.path.basename(each_file),os.path.getsize(each_file)))
    
40. 
    
41. 2.
    
42. import os
    
43. 
    
44. doc_path = input('请输入待查找的初始目录:')
    
45. while not os.path.isdir(doc_path):
    
46.     doc_path = input('没有这个路径,请重新输(输入exit退出):')
    
47.     if doc_path == 'exit':
    
48.         break
    
49. 
    
50. file_name = input('请输入需要寻找的目标文件:')
    
51. 
    
52. fold = os.walk(doc_path)
    
53. 
    
54. flag = 0
    
55. 
    
56. all_file = []
    
57. for each in fold:
    
58.     for each_file_name in each[2]:
    
59.         if file_name == each_file_name:
    
60.             print(each[0] +'/'+ file_name)
    
61.         else:
    
62.             flag = 1
    
63. if flag == 1:
    
64.     print('没有这个文件噢!')
    
65. 
    
66. 3.
    
67. import os
    
68. 
    
69. doc_path = input('请输入待查找的初始目录:')
    
70. while not os.path.isdir(doc_path):
    
71.     doc_path = input('输入错误,请重新输入:')
    
72. 
    
73. doc_walk = os.walk(doc_path)
    
74. 
    
75. file_path = []
    
76. 
    
77. for each_part in doc_walk:
    
78.     for each_file in each_part[2]:
    
79.         if '.avi' or '.mp4' or '.rmvb' in each_file.lower():
    
80.             file_path.append(os.path.join(each_part[0],each_file) + '\n' * 2)
    
81. 
    
82. print(file_path)
    
83. 
    
84. f = open('/Users/yufan/Documents/python编程/30sp/videoList.txt','w',encoding = 'GBK')
    
85. f.writelines(file_path)
    
86. f.close()
    
87. 
    
88. 4.
    
89. import os
    
90. 
    
91. keyword = input('请将该代码放于待查找的文件夹内,请输入关键字:')
    
92. allow = input('请问是否需要打印关键字 *%s* 在文件夹中的位置(yes/no):' % keyword)
    
93. while allow.lower() != 'yes':
    
94.     allow = input('逗你的,输入yes吧:')
    
95. 
    
96. cur_doc_path = os.getcwd()
    
97. 
    
98. all_file = os.walk(cur_doc_path)
    
99. 
    
100. txt_path = []
     
101. 
     
102. for each_part in all_file:
     
103.     for each_file in each_part[2]:
     
104.         if '.txt' in each_file:
     
105.             txt_path.append(os.path.join(each_part[0],each_file))
     
106. 
     
107. for each_path in txt_path:
     
108.     count = 1
     
109.     line = []
     
110.     position = []
     
111.     f = open(each_path,encoding = 'GBK')
     
112.     for each_line in f:
     
113.         line_position = []
     
114.         if keyword in each_line:
     
115.             line.append(count)
     
116.             for each in range(len(each_line)):
     
117.                 if keyword[0] == each_line[each]:
     
118.                     line_position.append(each+1)
     
119.             position.append(line_position)
     
120.         count += 1
     
121.     print('在文件*%s*中找到关键字*%s*' % (each_path,keyword))
     
122.     for each in range(len(line)):
     
123.         print('关键字出现在第 %d 行,第 ' % line[each],position[each],'个位置')

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