python tips: matplotlib plot option

#/usr/bin/env python
# coding:utf-8

import pg
import sys
import datetime
from pylab import *

def main():
    argvs = sys.argv
    argc = len(argvs)

    """ check argument """
    if (argc != 1 + 6):
        argument = "dbname dbuser dbpass fromdate todate dbtable_prefix"
        print "Usage: python %s %s" % (argvs[0], argument)
        sys.exit(1)

    dbname=argvs[1]
    dbuser=argvs[2]
    dbpass=argvs[3]
    fromdate=argvs[4]
    todate=argvs[5]
    prefix=argvs[6]

    """ initialization """
    initGraphParams()
    dbobj = getConnection(dbname, dbuser, dbpass)

    """ get X label """
    Lx = makeX(fromdate, todate)
    Lx2 = makeX2(fromdate, todate)


    """ get X,Y data """
    classes = getClassId()
    styles = ('-', 'x-', '+-', '*-')
    colors = ('b', 'g', 'r', 'c', 'm', 'y', 'k')
    count = 0
    for cls in classes:
        Ly = makeY(dbobj, Lx, prefix, 'class', cls, 'rows')
        style = styles[count % len(styles)]
        color = colors[count % len(colors)]
        plot(Lx2, Ly, style+color, label=cls)
        count += 1

    title('number of XXX')
    xlabel('date')
    ylabel('number')
    grid(True)
    legend(bbox_to_anchor=(1.01, 1), loc=2, ncol=2, borderaxespad=0.)
    show()
    dbobj.close()