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.

Answer: This was my subtle coding error. I left the empty parens out of the XML 
file's 'make' entry (last line below).

File: my_oot_my_block.xml

<block>
  <name>my_block</name>
  <key>my_oot_my_block</key>
  <category>my_oot</category>
  <import>import my_oot</import>
  <make>my_oot.my_block</make>  <- Forgot () after the name.  Case closed.