change-episodes.py

#!/usr/bin/env python

import re
import os

pattern = re.compile(r'\[(.*)\] (.*) - (\d*) (\d*p) \[anidb-(\d*)\].mp4')

for i,j,y in os.walk('.'):
    #i - directory
    #y list of files.

    #for filename in os.listdir("H:\Hunter x Hunter (2011)"):
    if len(y) > 0:
        if len(y) < 100:
            longformat = False
        else:
            longformat = True
        for filename in y:
            if pattern.match(filename):
                g = pattern.search(filename)
                if longformat:
                    episode = str("{0:0=3d}".format(int(g.group(3))))
                else:
                    episode = str("{0:0=2d}".format(int(g.group(3))))
                fansub = g.group(1)
                seriesname = g.group(2)
                anidbid = g.group(5)
                epformat = g.group(4)
                newname = "[" + fansub + "] " + seriesname + " - " + episode + " " + epformat + " [anidb-" + anidbid + "].mp4"
                oldname = r"{0}\{1}".format(i,filename)
                newformatname = r"{0}\{1}".format(i,newname)
                os.rename(oldname, newformatname)