Error in COBA network using NEURON backend

[chaoming0625]

Dear all, I run a COBA network, with the code listed in https://neuralensemble.org/docs/PyNN/examples/VAbenchmarks.html

I use NEURON backend (which is istalled through the pip install neuron), but I got the following error:

$ python pynn.py  neuron COBA
numprocs=1
Traceback (most recent call last):
  File "pynn.py", line 45, in <module>
    sim, options = get_simulator(
  File "/home/chaoming/softwares/miniconda3/envs/brainpy/lib/python3.8/site-packages/pyNN/utility/__init__.py", line 110, in get_simulator
    sim = import_module("pyNN.%s" % args.simulator)
  File "/home/chaoming/softwares/miniconda3/envs/brainpy/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 848, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/chaoming/softwares/miniconda3/envs/brainpy/lib/python3.8/site-packages/pyNN/neuron/__init__.py", line 23, in <module>
    from pyNN.neuron.standardmodels.cells import *
  File "/home/chaoming/softwares/miniconda3/envs/brainpy/lib/python3.8/site-packages/pyNN/neuron/standardmodels/cells.py", line 11, in <module>
    from pyNN.neuron.cells import (StandardIF, SingleCompartmentTraub,
  File "/home/chaoming/softwares/miniconda3/envs/brainpy/lib/python3.8/site-packages/pyNN/neuron/cells.py", line 518, in <module>
    class RandomSpikeSource(hclass(h.NetStimFD)):
  File "/home/chaoming/softwares/miniconda3/envs/brainpy/lib/python3.8/site-packages/neuron/hclass3.py", line 110, in __init_subclass__
    raise TypeError(
TypeError: `RandomSpikeSource` implements `__init__` but misses `__new__`. Class must implement `__new__` and call `super().__new__` with the arguments required by HOC to construct the underlying h.NetStimFD() HOC object.

[apdavison]

Hi, this error appears with the latest version of NEURON. We are working on fixing it. As a workaround, I suggest you try an earlier version of NEURON (7.x)

[chaoming0625]

Dear @apdavison , thanks for your suggestions. I fix this problem.

[apdavison]

fixed in #727