Import module sys
import sys
sys.argv command line parameters List, when the first element of the program itself path
sys.exit (n) to exit the program, when the normal exit exit (0)
sys.version get python interpreter version information
int sys.maxint maximum value (used only for python2)
int sys.maxsize maximum value (used only to python3)
sys.path return path search module, using the value of environment variable initialization PYTHONPATH
sys.platform return the name of the operating system platform
sys.stdout Linux in everything is a file (_io (file read and write operations))
Examples sys.stdout.write ( 'please') standard output lead progress bar, output please6. 6 characters in length
sys.stdin.read () has been read data, the standard input
sys.stdin.readline () to read a line, the standard input
sys.getrecursionlimit () Gets the maximum recursion layers (the default maximum 1000)
sys.setrecursionlimit (1200) set the maximum recursion layers
sys.getdefaultencoding () Gets the default encoding interpreter
sys.getfilesystemencoding () Gets save memory data to a file in the default encoding