mantra.py

import subprocess
import os
import glob
import sys

a = r"C:\\Program Files\\Side Effects Software\\Houdini 15.0.244.16\\bin\\mantra.exe"

folder = sys.argv[1]
start = int(sys.argv[2])
finish =  int(sys.argv[3])

for file in glob.glob(os.path.join(folder, "*.ifd")):
    nameFileExt =  os.path.basename(file)
    nameFile = os.path.splitext(nameFileExt)[0]
    frame = int(nameFile.split('.')[-1]) # 
    if frame <= finish and frame >= start:
        print frame
        cmd = []
        cmd.append(a)
        cmd.append('-V')
        cmd.append('2a')
        cmd.append('-f')
        cmd.append(file)
        subprocess.Popen(cmd).wait()