My first Python script

downloadsomemusic.py

#!/usr/bin/python

# Script for downloading music from sites:
# www.mnogomp3.net
# www.tenshi.spb.ru

import getopt
import sys
import os
import re


verbose = False

try:
    opts, args = getopt.getopt(sys.argv[1:], "hv", ["help", "verbose"])
except getopt.error, msg:
    print msg
    print "for help use --help"
    sys.exit(2)

for o, a in opts:
    if o in ("-h", "--help"):
        print __doc__
        sys.exit(0)
    if o in ("-v", "--verbose"):
        verbose = True


# Checkout arguments, passed with command...
if len(args) == 0:
    print "Error: No file with artists and albums."
    sys.exit(0)
elif len(args) > 1:
    print "Error: Too many options."
    sys.exit(0)
elif not os.path.exists(args[0]):
    print "Error: No such file."
    sys.exit(0)
else:
    artalbfile = open(args[0])

def preplistfromfile(somefile):
    list = somefile.readlines()
    for i in xrange(0, len(list)):
        list[i] = list[i].rstrip()
    return list

artalburlist = preplistfromfile(artalbfile)

for artalburl in artalburlist:
    artalb = artalburl.replace("http://www.mnogomp3.net/mp3/", "").split("/")
    artist = artalb[0].replace("_", " ").title()
    album = artalb[1].replace("_", " ").title()
    del artalb

    if not (os.path.exists(artist) and os.path.isdir(artist)):
        os.mkdir(artist)

    os.chdir(artist)

    if not (os.path.exists(album) and os.path.isdir(album)):
        os.mkdir(album)

    os.chdir(album)

    if not os.path.exists("sourcepage"):
        os.system("wget " + artalburl + " -O sourcepage")
        os.system("recode -f UTF8..ascii sourcepage")

    if not os.path.exists("urlist"):
        os.system("touch urlist")
        os.system('cat sourcepage | grep ">mp3<" | sed "s/\[.*href=\\"//" | sed "s/\\".*\]//" | sed "s/^    /http:\/\/www.mnogomp3.net/g" | sed "s/\\".*//g" > urlist')

    if not os.path.exists("donelist"):
        os.system("touch donelist")

    urlistfile = open("urlist")
    urlist = preplistfromfile(urlistfile)
    urlistfile.close()

    donelistfile = open("donelist", 'r')
    donelist = preplistfromfile(donelistfile)
    donelistfile.close()

    for mp3url in urlist:
        if mp3url in donelist:
            continue
        wgetresult = os.system("wget -c --progress=dot --read-timeout=20 --tries=inf " + mp3url)
        # failure > 1, success == 0
        if wgetresult == 0:
            donelistfile = open("donelist", 'a')
            donelistfile.write(mp3url + "\n")
            donelistfile.close()

    os.chdir(os.pardir)
    os.chdir(os.pardir)