code() takes at most 15 arguments when running any command.

[scuml]

Getting an error no matter what I run or register through gearsclient.

Even noop code like:

gb = GearsBuilder('KeysOnlyReader', r=conn)
gb.run()

returns

Traceback (most recent call last):
  File "<input>", line 1, in <module>
    gb3.run()
  File "/Users/<user>/Library/Caches/pypoetry/virtualenvs/gears-5k_d3sYO-py3.8/lib/python3.8/site-packages/gearsclient/redisgears_builder.py", line 314, in run
    ''' % selfBytes
  File "/Users/<user>/Library/Caches/pypoetry/virtualenvs/gears-5k_d3sYO-py3.8/lib/python3.8/site-packages/redis/client.py", line 901, in execute_command
    return self.parse_response(conn, command_name, **options)
  File "/Users/<user>/Library/Caches/pypoetry/virtualenvs/gears-5k_d3sYO-py3.8/lib/python3.8/site-packages/redis/client.py", line 915, in parse_response
    response = connection.read_response()
  File "/Users/<user>/Library/Caches/pypoetry/virtualenvs/gears-5k_d3sYO-py3.8/lib/python3.8/site-packages/redis/connection.py", line 756, in read_response
    raise response
redis.exceptions.ResponseError: ['Traceback (most recent call last):\n', '  File "<string>", line 3, in <module>\n', 'TypeError: code() takes at most 15 arguments (16 given)\n']

conn.execute_command("RG.PYEXECUTE", "GB().run()"). works fine.

Running on python 3.8 on Mac OS 10.15.5 connecting to current RedisGears docker image. I did manually change .dumps() in the library to use pickle protocol 4 since python 3.8 defaults to protocol 5 which doesn't exist in the RedisGear docker image using python 3.7.
eg: selfBytes = cloudpickle.dumps(self.pipe, protocol=4)

[MeirShpilraien]

@scuml thanks for reporting, seems like on python 3.8, a new field was added to the code object calls co_posonlyargcount.
You can see the differences in the definitions here:
https://docs.python.org/3/library/inspect.html
https://docs.python.org/3.7/library/inspect.html

When you use python3.8, it serializes this value, but python3.7 does not expect this value and it raises this error. I will dig further to try to find a workaround but until then you will have to switch to Python 3.7 or not using this library and just send your python code as text using RG.PYEXECUTE command.