同理，构建一个python的blcok，多了init的python文件。

'''
This is the GNU Radio PYBLOCK module. Place your Python package
description here (python/__init__.py).
'''

# import swig generated symbols into the pyblock namespace
try:
    # this might fail if the module is python-only
    from pyblock_swig import *
except ImportError:
    pass

# import any pure python here
from pyblock import pyblock
#

python源代码文件。

import numpy
from gnuradio import gr

class pyblock(gr.basic_block):
    """
    docstring for block pyblock
    """
    def __init__(self):
        gr.basic_block.__init__(self,
            name="pyblock",
            in_sig=[<+numpy.float+>],
            out_sig=[<+numpy.float+>])

    def forecast(self, noutput_items, ninput_items_required):
        #setup size of input_items[i] for work call
        for i in range(len(ninput_items_required)):
            ninput_items_required[i] = noutput_items

    def general_work(self, input_items, output_items):
        output_items[0][:] = input_items[0]
        consume(0, len(input_items[0]))
        #self.consume_each(len(input_items[0]))
        return len(output_items[0])