Properties and methods of OS Library

chdir： Modify working directory ——os.chdir(“path”)

 

curdir： Get the current directory , Return to relative path ——os.curdir

getcwd： View current directory , Return to absolute path ——os.getcwd()

chmod： Modify file or directory permissions ——os.chmod(path.mode)

cpu_count： return cpu Number of threads corresponding to the core （2 nucleus 4 Threads )——os.cpu_count()

close： Close file path ——os.close(path)

kill： Kill process by process number （ Use with caution ）——os.kill(pid, sig)

getpid：  Get the current process number ——os.getpid()

getppid： Returns the parent process number of the current process —— os.getppid()

linesep： Displays the newline character under the current system ——os.linesep

 

 sep： Get the current path delimiter ——os.sep

 pathsep： Get the environment variable delimiter ——os.pathsep

listdir： Return all files in the corresponding directory , Including hidden files ——os.listdir(path)

 

makedirs： Create directory      ( It can support multi-level directories )——os.makedirs(path)

mkdir： Create directory   It can only be one floor ——os.mkdir(path)

 

open： create a file ——file = os.open(‘filename,‘ File format ’,‘w’)

remove: Delete file ——os.remove(" file name ")

removedirs: Delete directory , Support multi-level deletion ——os.removedirs(path)

system： Execute terminal commands , stay cmd The output content will be output directly on the console , The return result is 0 Indicates successful execution ——os.system()      Such as , Clear screen operation os.system(cls)

  notes ：os.system It's simple and rough execution cmd Instructions , If you want to get cmd Output content , You can't get it

'DirEntry', 'F_OK', 'MutableMapping', 'O_APPEND', 'O_BINARY', 'O_CREAT', 'O_EXCL', 'O_NOINHERIT', 'O_RANDOM', 'O_RDONLY', 'O_RDWR', 'O_SEQUENTIAL', 'O_SHORT_LIVED', 'O_TEMPORARY', 'O_TEXT', 'O_TRUNC', 'O_WRONLY', 'P_DETACH', 'P_NOWAIT', 'P_NOWAITO', 'P_OVERLAY', 'P_WAIT', 'PathLike', 'R_OK', 'SEEK_CUR', 'SEEK_END', 'SEEK_SET', 'TMP_MAX', 'W_OK', 'X_OK', '_AddedDllDirectory', '_Environ', '__all__', '__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__spec__', '_execvpe', '_exists', '_exit', '_fspath', '_get_exports_list', '_putenv', '_unsetenv', '_wrap_close', 'abc', 'abort', 'access', 'add_dll_directory', 'altsep', 'closerange', 'defpath', 'device_encoding', 'devnull', 'dup', 'dup2', 'environ', 'error', 'execl', 'execle', 'execlp', 'execlpe', 'execv', 'execve', 'execvp', 'execvpe', 'extsep', 'fdopen', 'fsdecode', 'fsencode', 'fspath', 'fstat', 'fsync', 'ftruncate', 'get_exec_path', 'get_handle_inheritable', 'get_inheritable', 'get_terminal_size',  'getcwdb', 'getenv', 'getlogin', 'isatty', 'link', 'lseek', 'lstat', '', 'name', 'pardir', 'path', 'pipe', 'popen', 'putenv', 'read', 'readlink','rename', 'renames', 'replace', 'rmdir', 'scandir', 'set_handle_inheritable', 'set_inheritable', 'spawnl', 'spawnle', 'spawnv', 'spawnve', 'st', 'startfile', 'stat', 'stat_result', 'statvfs_result', 'strerror', 'supports_bytes_environ', 'supports_dir_fd', 'supports_effective_ids', 'supports_fd', 'supports_follow_symlinks', 'symlink', 'sys', 'terminal_size', 'times', 'times_result', 'truncate', 'umask', 'uname_result', 'unlink', 'urandom', 'utime', 'waitpid', 'walk', 'write'