Re: [Discuss-gnuradio] AttributeError: 'function' object has no attribute 'to_basic_block' ? (GR 3.7.0)

[Monahan-Mitchell, Tim]

>> One of my OOT blocks is a function that takes in shorts and outputs shorts 
>> (a 1-to-2 interpolator).

>> I have a simple flowgraph created in GRC:   File Source -> My block -> File 
>> sync .

>> GRC is happy until I run the flowgraph, and I get this:

>> Executing: "<....> /top_block.py"

>> Traceback (most recent call last):
>>   File "<....> /top_block.py", line 54, in <module>
>>     tb = top_block()
>>   File "<....> /top_block.py", line 39, in __init__
>>     self.connect((self.my_block_s_to_s_0, 0), (self.blocks_file_sink_0, 0))
>>   File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py", 
>> line 130, in connect
>>     self._connect(points[i-1], points[i])
>>   File "/usr/local/lib/python2.7/dist-packages/gnuradio/gr/top_block.py", 
>> line 141, in _connect
>>     self._tb.primitive_connect(src_block.to_basic_block(), src_port,
>> AttributeError: 'function' object has no attribute 'to_basic_block'

I have found the error (or at least I am closer): The Python code that GRC 
generates is slightly different between v3.6.4.2 and v3.7.0 for the same test 
flowgraph. Namely, the newer version omits an empty set of parens, thusly:

>From v3.6.4.2 :

                ##################################################
                # Blocks
                ##################################################
                self.my_oot_my_block_0 = my_oot.my_block()

>From v3.7.0 :

                ##################################################
                # Blocks
                ##################################################
                self.my_oot_my_block_0 = my_oot.my_block

My block has no parameters (thus the empty parens).

If I manually edit the v3.7.0 generated py code to add the missing parens, it 
all works fine as with v3.6.4.2.

Question: Is this a v3.7.0 bug, or some subtle coding error in my OOT module? 
As far as I can tell, I converted it according to the 3.6 -> 3.7 recipe.