def usage():
    'Print Usage and exit'
    print('')
    print('Usage:')
    print((('      ' + sys.argv[0]) + ' qprep-wt.pdb  res1 [ res2 ...] ]'))
    print('')
    sys.exit(ERR_USAGE)
Print Usage and exit
def usage():
    
    print()
    print('Usage:')
    print((('      ' + sys.argv[0]) + ' qprep-wt.pdb  res1 [ res2 ...] ]'))
    print()
    sys.exit(ERR_USAGE)