1. os module
1 os.getcwd() Get the current working directory, that is, the directory path where the current python script works
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3 os.chdir("dirname") changes the working directory of the current script; equivalent to cd under the shell
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5 os.curdir returns the current directory: ('.')
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7 os.pardir Get the current directory string name: ('..')
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9 os.makedirs('dirname1/dirname2') can generate multi-level recursive directories
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11 os.removedirs('dirname1') If the directory is empty, delete it; and recurse to the previous directory, if it is also empty, delete it,
12 and so on
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14 os.mkdir('dirname') Generate a stand-alone directory; equivalent to shell mkdir dirname
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16 os.rmdir('dirname') Delete a single-level empty directory. If the directory is not empty, it cannot be deleted, and an error is reported; equivalent to
17 shell种rmdir dirname
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19 os.listdir('dirname') List all files and sub-file directories in the specified directory, including hidden files, and print them in a list
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21 os.remove() removes a file
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23 os.rename("oldname","newname") rename file/directory
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25 os.stat('path/filename') Get file/directory information
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27 os.sep output the path separator specific to the operating system, "\\" under win, "\n" under Linux
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29 os.linesep The string used to split the file path is ';' under win, and ':' under Linux
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31 os.name Output string Knowledge of the current platform in use. win -> 'nt';Linux -> 'posix'
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33 os.system("bash command") Run the shell command and display it directly
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35 os.environ Get system environment variables
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37 os.path.abspath(path) returns the normalized absolute path of path
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39 os.path.split(path) split path into directory and file name two-tuple return
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41 os.path.dirname(path) Returns the directory of path. In fact, it is the first element of os.path.split (path)
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43 os.path.basename(path) Returns the last filename of path. If the path ends with / or \, then it will return a null value, i.e.
44 The second element of os.path.split(path)
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46 os.path.exists(path) If path exists, return True; if path does not exist, return False
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48 os.path.isfile(path) If path is an existing file, return T to enter Russian, otherwise return False
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50 os.path.isabs(path) If it is an absolute path, return True
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52 os.path.isdir(path) If path is an existing directory, return True, otherwise return False
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54 os.path.join(path1[,path2[,...]]) Returns after combining multiple paths, the parameter before the first absolute path
55 will be ignored
56
57 os.path.getatime(path) Returns the last access time of the file or directory desired by path
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59 os.path.getmtime(path) Returns the last modification time of the pointed file or directory
1 import os 2 # print(os.getcwd()) #获取该脚本当前的目录路径 3 # os.chdir('..') #去当前目录的上一级目录路径 4 # print(os.getcwd()) 5 6 7 print(os.path.split(r"C:/python36练习题/day22/day22.py"))#将该路径与文件名切割，一元组形式打印 8 print(os.path.dirname(r"C:/python36练习题/day22/day22.py" )) #返回 该文件所在文件夹路径 9 print(os.path.basename(r"C:/python36练习题/day22/day22.py")) # 返回该文件名 10 a = 'C:/python36练习题' 11 b = 'day22/day22.py' 12 print(os.path.join(a,b)) #路径拼接
二、sys模块
1 sys.argv 命令行参数List,第一个元素是程序本身路径 2 sys.exit(n) 退出程序，正常退出时exit(0) 3 sys.version 获取python解释程序的版本信息 4 sys.maxint 最大的int值 5 sys.path 返回模块的搜索路径，初始化时使用pythonpath 环境变量的值 6 sys.platform 返回操作系统平台名称 7
1 import sys 2 print(sys.argv) 3 4 command=sys.argv[1] 5 path=sys.argv[2] 6 7 if command=="post": 8 pass 9 10 elif command=="get": 11 pass 12 13 import time 14 for i in range(100): 15 sys.stdout.write("#") 16 time.sleep(0.1) 17 sys.stdout.flush()