[Discuss-gnuradio] Problem using Parser

[Ahmet Hasim Gokceoglu]

Hi,

I am trying to write a code for qpsk receiver and want to get some
parameters from the user by using parser. However I get some error
when I execute the code

#!/usr/bin/env python

from gnuradio import gr, gru, eng_notation, optfir, modulation_utils
from gnuradio import usrp
from gnuradio import blks2
from gnuradio.eng_option import eng_option
from optparse import OptionParser
from usrpm import usrp_dbid
import math
import sys
import wx


#import psk
import cmath
from pprint import pprint


class qpsk_rx_block(gr.hier_block2):

        def __init__(self,argv):

                gr.hier_block2.__init__(self, "qpsk_rx_block",
                                                                
gr.io_signature(1, 1, gr.sizeof_char),       # Input signature
                                                                
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature

                parser=OptionParser(option_class=eng_option)
                parser.add_option("-R", "--rx-subdev-spec",
type="subdev", default=None,
                          help="select USRP Rx side A or B (default=A)")
                parser.add_option("-f", "--freq", type="eng_float",
default=100.1e6,
                          help="set frequency to FREQ", metavar="FREQ")

                (options, args) = parser.parse_args()


I get the error

address@hidden:/usr/share/gnuradio/examples/digital$
./QPSK_receiver.py
Traceback (most recent call last):
  File "./QPSK_receiver.py", line 39, in <module>
    class qpsk_rx_block(gr.hier_block2):
  File "./QPSK_receiver.py", line 48, in qpsk_rx_block
    parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=None,
NameError: name 'parser' is not defined

Does anybody have any idea?