Install any package to coderpad

coderpad.py

def main():
    # Application code goes here!
    pass



PACKAGES = ("praw", )
### IGNORE BELOW THIS LINE ###

def run(cmd, shell=False, silent=False):
    import subprocess, shlex, os
    args = shlex.split(cmd)
    if silent:
        with open(os.devnull) as DEVNULL:
            return subprocess.call(args, stdout=DEVNULL, stderr=subprocess.STDOUT)
    else:
        subprocess.call(args, shell=shell)
def do_packages(package, *packages):
    import sys, os
    all_packages = (package,) + packages
    print "Installing packages: {}".format(", ".join(all_packages))
    user = os.environ.get("HOME")
    site_packages = os.path.join(user, ".local/lib/python2.7/site-packages")
    sys.path.append(site_packages)
    run("pip install --user {}".format(" ".join((package,) + packages)), silent=True)
def go(args=""):
    if PACKAGES:
        do_packages(*PACKAGES)
    print "Setup complete... Running main.\n\n\n"
    run("python /home/coderpad/solution.py GOGO {}".format(args))
import sys
if len(sys.argv) > 1 and sys.argv[1] == "GOGO":
    sys.argv.pop(0)
    main()
else:
    print "Run go() in the REPL to run your program!"

I don't understand how to use this. For example, how does this help if I want to install the matplotlib library in CoderPad?