Common operations for Python files

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2. #-*-coding:utf8-*-
6. "' "
8. Python common file Operations examples
12. Path name access functions in the Os.path module
14. Separated
16. basename () Remove directory path, return file name
18. DirName () Remove file name, return directory path
20. Join () combines parts of the separation into one path name
22. Split () return (DirName (), basename ()) tuple
24. Splitdrive () return (drivename, pathname) tuple
26. Splitext () return (filename, extension) tuple
30. Information
32. Getatime () returns the last access time
34. Getctime () returns file creation time
36. Getmtime () returns the last file modification time
38. GetSize () returns the file size (in bytes)
42. Inquire
44. Exists () specifies whether the path (file or directory) exists
46. Isabs () Specifies whether the path is an absolute path
48. Isdir () Specifies whether the path exists and is a directory
50. Isfile () Specifies whether the path exists and is a file
52. Islink () Specifies whether the path exists and is a symbolic link
54. Ismount () Specifies whether the path exists and is a mount point
56. Samefile () Two path names pointing to the same file
60. Os.path.isdir (name): Determine if Name is a directory, name is not a directory and return false
62. Os.path.isfile (name): Determine if name is not a file, does not exist name also returns false
64. Os.path.exists (name): Determine if there is a file or directory name
66. Os.path.getsize (name): Get file size, if name is directory return 0L
68. Os.path.abspath (name): Get absolute path
70. Os.path.normpath (PATH): Canonical path string form
72. Os.path.split (name): Split file name and directory (in fact, if you use the directory completely, it will also separate the last directory as the file name, and it will not determine whether the file or directory exists)
74. Os.path.splitext (): Detach file name and extension
76. Os.path.join (path,name): Connection directory with file name or directory
78. Os.path.basename (PATH): Return file name
80. Os.path.dirname (PATH): Return file path
86. File operations in the OS module:
88. OS Module Properties
90. Linesep string used to separate rows in a file
92. The string that Sep uses to separate the file path name
94. Pathsep string used to separate file paths
96. CurDir the string name of the current working directory
98. Pardir (current working directory) parent directory string Name
102. 1. Renaming: Os.rename (old, new)
106. 2. Delete: Os.remove (file)
110. 3. List files in directory: Os.listdir (PATH)
114. 4. Get current working directory: OS.GETCWD ()
118. 5. Change of working directory: Os.chdir (newdir)
122. 6. Create a multilevel directory: Os.makedirs (r "C:\python\test")
126. 7. Create a single directory: Os.mkdir ("Test")
130. 8. Delete Multiple directories: Os.removedirs (r "C:\python") #删除所给路径最后一个目录下所有空目录.
134. 9. Delete a single directory: Os.rmdir ("Test")
138. 10. Get File attributes: Os.stat (file)
142. 11. Modify file permissions and timestamps: Os.chmod (file)
146. 12. Execute operating system command: Os.system ("dir")
150. 13. Start a new process: Os.exec (), OS.EXECVP ()
154. 14. Executing the program in the background: OSSPAWNV ()
158. 15. Terminate the current process: Os.exit (), Os._exit ()
162. 16. Detach file Name: Os.path.split (r "c:\python\hello.py")--("C:\\python", "hello.py")
166. 17. Detach Extension: Os.path.splitext (r "c:\python\hello.py")--("C:\\python\\hello", ". Py")
170. 18. Get path name: Os.path.dirname (r "c:\python\hello.py")--"C:\\python"
174. 19. Get File Name: Os.path.basename (r "r:\python\hello.py")--"hello.py"
178. 20. Determine if the file exists: os.path.exists (r "c:\python\hello.py")---True
182. 21. Determine if absolute path: Os.path.isabs (r ". \python\")---False
186. 22. Determine if it is a directory: Os.path.isdir (r "C:\python")--True
190. 23. Determine if it is a file: Os.path.isfile (r "c:\python\hello.py")---True
194. 24. Determine if it is a linked file: Os.path.islink (r "c:\python\hello.py")---False
198. 25. Get File Size: os.path.getsize (filename)
202. 26.*******:os.ismount ("c:\\")--True
206. 27. Search all files in directory: Os.path.walk ()
210. Shutil the operation of the module to the file:
212. 1. Copying individual files: shultil.copy (Oldfile, Newfle)
216. 2. Copy Entire directory tree: Shultil.copytree (r ". \setup", R ". \backup")
220. 3. Delete entire directory tree: Shultil.rmtree (r ". \backup")
224. Operations for temporary files:
226. 1. Create a unique temporary file: tempfile.mktemp ()---filename
230. 2. Open temporary file: tempfile. Temporaryfile ()
234. Memory files (Stringio and Cstringio) operations
236. [4.StringIO] #cStringIO是StringIO模块的快速实现模块
240. 1. Create the memory file and write the initial data: F = Stringio.stringio ("Hello world!")
244. 2. Read in memory file data: Print F.read () #或print f.getvalue ()--Hello world!
248. 3. Want the memory file to write data: F.write ("Good day!")
252. 4. Close the memory file: F.close ()
254. ‘‘‘
256. Import OS
258. Import Os.path
260. Import UnitTest
262. Import time
264. #import Pygame
268. Class Pyfilecommonoperatortest (UnitTest. TestCase):
270. def __init__ (self):
272. "" " constructor " ""
276. def test01 (self):
278. Print Os.linesep
280. Print Os.sep
282. Print Os.pathsep
284. Print Os.curdir
286. Print Os.pardir
288. print os.getcwd ()
290. print ' unittest here '
296. if __name__ = = "__main__":
298. t = pyfilecommonoperatortest ()
300. T.TEST01 ()

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2. #读文件的写法:
4. #读文本文件:
6. input = open (' data ', ' R ')#第二个参数是默认的, can not be added
8. #读二进制文件:
10. input = open (' data ', ' RB ')
12. #读取所有文件内容:
14. Open (' xxoo.txt '). Read ()
16. #读取固定字节
18. Open (' abinfile ', ' RB '). Read (+)
20. #读每行
22. File_object.readlines ()

Common operations for Python files