Python standard library Sys

1. Command-line Parameters SYS.ARGV

Let's start with the example in the first part of the Python language module and see what's in the SYS.ARGV.

1 # Filename:using_sys.py 2 Import SYS 3 4 i=05 for in sys.argv:6    Print ('sys.argv[%d]:%s'%(i,item))7    i=i+1

Output:

$python using_sys.py-param1-param2-param3sys.argv[0]: using_sys.pysys.argv[1]:-param1sys.argv[ 2]:-param2sys.argv[3]:-PARAM3

Do you think that under Linux, a command corresponds to a number of parameters. Now you can also implement one of these commands.

2. Standard input Sys.stdin

Has the same type as a readable file object.

3. Standard output Sys.stdout

Has the same type as a writable file object.

4. Standard error Stream Sys.stderr

5. Other

Sys.version provides installed Python version information

Python standard library Sys