What does the sys module do in python?

[mahela007]

What does the sys module do in python?
and what is sys.argv?

[Gribouillis]

Look here :)

[mahela007]

That's exactly where I checked. I don't understand what the documentation says..
More specifically I don't understand this
"sys.argv¶

The list of command line arguments passed to a Python script. argv[0] is the script name (it is operating system dependent whether this is a full pathname or not). If the command was executed using the -c command line option to the interpreter, argv[0] is set to the string '-c'. If no script name was passed to the Python interpreter, argv[0] is the empty string."

here

[vegaseat]

Maybe a little example will help ...

import sys

args = sys.argv

print(args)
print( "Source  file: %s" % args[0] )
# use any of these arguments in your code
print( "Argument one: %s" % args[1] )
print( "Argument two: %s" % args[2] )


"""
my output after saving this code as sysargs1.py and 
entering a few arguments on the command line -->
['D:/Python25/Bull/sysargs1.py', 'myarg1', 'myarg2']
Source  file: D:/Python25/Bull/sysargs1.py
Argument one: myarg1
Argument two: myarg2
"""

[mahela007]

So for the last two to have values, is it compulsory for the program to be run via command line?

[Gribouillis]

You can run it with module subprocess as well

import subprocess
child = subprocess.Popen("sysargs1.py myarg1 myrag2", shell=True)

[mahela007]

What does that module do?

[Gribouillis]

It allows your program to launch other programs and communicate with them.

[mahela007]

thanks