Unpacking errors

[mitar]

When I am trying to run flake8 with this plugin enabled, I get the following error:

Exception in thread Thread-3:
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.6/multiprocessing/pool.py", line 463, in _handle_results
    task = get()
  File "/usr/local/lib/python3.6/multiprocessing/connection.py", line 251, in recv
    return _ForkingPickler.loads(buf.getbuffer())
TypeError: __init__() missing 3 required positional arguments: 'type', 'value', and 'context'

Python 3.6.3.

Not sure how can I debug this.

[mitar]

That's the value of the buffer trying to be unpickled:

b'\x80\x03K\x00K\x05\x89cmultiprocessing.pool\nrebuild_exc\nq\x00cawpa.pgen2.parse\nParseError\nq\x01X4\x00\x00\x00bad input: type=23, value=\'.\', context=(\'\', (25, 4))q\x02\x85q\x03Rq\x04}q\x05(X\x03\x00\x00\x00msgq\x06X\t\x00\x00\x00bad inputq\x07X\x04\x00\x00\x00typeq\x08K\x17X\x05\x00\x00\x00valueq\tX\x01\x00\x00\x00.q\nX\x07\x00\x00\x00contextq\x0bX\x00\x00\x00\x00q\x0cK\x19K\x04\x86q\r\x86q\x0eubX\xce\x05\x00\x00\n"""\nTraceback (most recent call last):\n  File "/usr/local/lib/python3.6/multiprocessing/pool.py", line 119, in worker\n    result = (True, func(*args, **kwds))\n  File "/usr/local/lib/python3.6/multiprocessing/pool.py", line 44, in mapstar\n    return list(map(*args))\n  File "/usr/local/lib/python3.6/site-packages/flake8/checker.py", line 648, in _run_checks\n    return checker.run_checks()\n  File "/usr/local/lib/python3.6/site-packages/flake8/checker.py", line 579, in run_checks\n    self.run_ast_checks()\n  File "/usr/local/lib/python3.6/site-packages/flake8/checker.py", line 493, in run_ast_checks\n    for (line_number, offset, text, check) in runner:\n  File "/usr/local/lib/python3.6/site-packages/ebb_lint/flake8.py", line 216, in run\n    tree, trailing_newline = self._grammar.parse_source(self.source)\n  File "/usr/local/lib/python3.6/site-packages/awpa/pgen2/grammar.py", line 142, in parse_source\n    tree = Driver(self, convert=convert).parse_string(source)\n  File "/usr/local/lib/python3.6/site-packages/awpa/pgen2/driver.py", line 111, in parse_string\n    return self.parse_tokens(tokens, debug)\n  File "/usr/local/lib/python3.6/site-packages/awpa/pgen2/driver.py", line 75, in parse_tokens\n    if p.addtoken(type, value, (prefix, start)):\n  File "/usr/local/lib/python3.6/site-packages/awpa/pgen2/parse.py", line 159, in addtoken\n    raise ParseError("bad input", type, value, context)\nawpa.pgen2.parse.ParseError: bad input: type=23, value=\'.\', context=(\'\', (25, 4))\n"""q\x0f\x86q\x10Rq\x11\x86q\x12\x87q\x13.'

[mitar]

OK, I figured it out. I had such method defined:

@abc.abstractmethod
def foobar(self):
    ...

Changing it to pass instead of ... removed the problem.

So it seems awpa cannot parse ....

[Julian]

Closing this here since yeah seems like this is something to solve upstream.