#!/opt/conda/conda-bld/bx-python_1733802355882/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_pla/bin/python

"""
Print the number of bases in a nib file.

usage: %prog nib_file
"""

import sys

from bx.seq import nib as seq_nib

with open(sys.argv[1]) as f:
    nib = seq_nib.NibFile(f)
print(nib.length)
