mergers.py

from yt.mods import *
from yt.analysis_modules.halo_merger_tree.api import *
from yt.analysis_modules.halo_finding.api import *
import sys,os

filen=os.getcwd()
files = []
start = int(sys.argv[1])
finish = int(sys.argv[2])
for i in range(start, finish + 1):
    files.append(filen+'/DD%04d/output_%04d' % (i, i))

db=filen+'/halos.db'
MergerTree(restart_files=files, database=db)