def _get_read_xy(read_name):
 number = _string_as_base_36(read_name[9:])
 return divmod(number, 4096)

def _get_read_xy ( read_name ) : number = _string_as_base_36 ( read_name [ 9 : ] ) return divmod ( number , 4096 )
extract coordinates from last 5 characters of read name .