fs.ua downloader

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import sys
import urllib
import urllib2
import locale
reload(sys)

def help():
    print "\nfsget fsua_[number].txt\n"
    print "Only for fs.ua file lists\n"
    return None

# URL-encoded to UTF-8
def fs_decode(localline):
    return urllib.unquote(localline).decode('utf8')

# Logics itself
if (len(sys.argv) != 2):
    help()
else:
    filename = sys.argv[1]
    if(os.path.exists(filename) and os.path.isfile(filename)):
        # print "valid file"
        myfile = open(filename, 'r')
        line = myfile.readline()
        block_sz = 8192
        while (line != None) and (line != ""):
            decoded_line = fs_decode(line)

            file_name = decoded_line.split('/')[-1]
            file_name = file_name.replace(file_name[-1], "")
            file_name = file_name.replace(file_name[-1], "")
            if(os.path.isfile(file_name)):
                file_size_dl = int(os.path.getsize(file_name))
            else:
                file_size_dl = 0
            u = urllib2.urlopen(line)
            meta = u.info()
            file_size = int(meta.getheaders("Content-Length")[0])
            print "Downloading: %s\nBytes: %s" % (file_name, file_size)
            # print "Remote file size = "+str(file_size)+";"
            # print "Local file size = "+str(file_size_dl)+";"
            if(file_size != file_size_dl):
                f = open(file_name, 'wb')
                while True:
                    buffer = u.read(block_sz)
                    if not buffer:
                        break

                    file_size_dl += len(buffer)
                    f.write(buffer)
                    status = r"%10d  [%3.2f%%]" % (file_size_dl, file_size_dl * 100. / file_size)
                    status = status + chr(8)*(len(status)+1)
                    print status,
                f.close()
            else:
                print "File '"+file_name+"' seems to downloaded already!"
            line = myfile.readline()

    else:
        print "invalid file"