Problems with generating mcf file

While I tried to use mcfgen.py to generate a mcf file,I ran into problems.I utilized the pentane.pdb provided in the Scripts.The following is my problem and I cannot understand it.

[tzq@cmnode_r730 MCF_Generation]$ python mcfgen.py pentane.pdb
Traceback (most recent call last):
File "mcfgen.py", line 36, in <module>
import sys, os, argparse, linecache, re
ImportError: No module named argparse

My problem has already been solved according to your kind suggestion.Thank you ,Emarin.