#!/bin/python

import glob
import os.path
import subprocess

prefix="image_"

for i in range(0, 10000):
    if os.path.exists(prefix + str(i) + "-0.png"):

        print i

        file_filter = prefix + str(i) + "-*.png"
        file_list = [f for f in glob.glob(file_filter)]

        params = ['convert', '-delay', '10', '-loop', '0', '-dispose', 'previous']
        params.extend(file_list)
        params.extend(['-layers', 'TrimBounds', str(i) + '.gif'])
        print params
        subprocess.check_call(params)