os模块
Tasks Tools
Shell variables os.environ
Running programs os.system, os.popen, os.popen2/3/4, os.startfile
Spawning processes os.fork, os.pipe, os.exec, os.waitpid, os.kill
Descriptor files, locks os.open, os.read, os.write
File processing os.remove, os.rename, os.mkfilefo, os.mkdir, os.rmdir
Administrative tools os.getcwd, os.chdir, os.chmod, os.getpid, os.listdir
Portability tools os.sep, os.pathsep, os.curdir, os.path.split, os.path.join
Pathname tools os.path.exits, os.path.isdir, os.path.getsize