(coala) akhelesh@Hubble:/media/Vol-B/Projects/coala-bears$ pytest ./tests/python/PyLintBearTest.py
Traceback (most recent call last):
  File "/usr/local/bin/pytest", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/dist-packages/_pytest/config/__init__.py", line 55, in main
    config = _prepareconfig(args, plugins)
  File "/usr/local/lib/python3.6/dist-packages/_pytest/config/__init__.py", line 180, in _prepareconfig
    pluginmanager=pluginmanager, args=args
  File "/usr/local/lib/python3.6/dist-packages/pluggy/hooks.py", line 258, in __call__
    return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
  File "/usr/local/lib/python3.6/dist-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/usr/local/lib/python3.6/dist-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec_opts.get('firstresult'),
  File "/usr/local/lib/python3.6/dist-packages/pluggy/callers.py", line 196, in _multicall
    gen.send(outcome)
  File "/usr/local/lib/python3.6/dist-packages/_pytest/helpconfig.py", line 89, in pytest_cmdline_parse
    config = outcome.get_result()
  File "/usr/local/lib/python3.6/dist-packages/pluggy/callers.py", line 76, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/usr/local/lib/python3.6/dist-packages/pluggy/callers.py", line 180, in _multicall
    res = hook_impl.function(*args)
  File "/usr/local/lib/python3.6/dist-packages/_pytest/config/__init__.py", line 612, in pytest_cmdline_parse
    self.parse(args)
  File "/usr/local/lib/python3.6/dist-packages/_pytest/config/__init__.py", line 777, in parse
    self._preparse(args, addopts=addopts)
  File "/usr/local/lib/python3.6/dist-packages/_pytest/config/__init__.py", line 739, in _preparse
    early_config=self, args=args, parser=self._parser
  File "/usr/local/lib/python3.6/dist-packages/pluggy/hooks.py", line 258, in __call__
    return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
  File "/usr/local/lib/python3.6/dist-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/usr/local/lib/python3.6/dist-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec_opts.get('firstresult'),
  File "/usr/local/lib/python3.6/dist-packages/pluggy/callers.py", line 201, in _multicall
    return outcome.get_result()
  File "/usr/local/lib/python3.6/dist-packages/pluggy/callers.py", line 76, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/usr/local/lib/python3.6/dist-packages/pluggy/callers.py", line 180, in _multicall
    res = hook_impl.function(*args)
  File "/home/akhelesh/.local/lib/python3.6/site-packages/pytest_cov/plugin.py", line 98, in pytest_load_initial_conftests
    plugin = CovPlugin(early_config.known_args_namespace, early_config.pluginmanager)
  File "/home/akhelesh/.local/lib/python3.6/site-packages/pytest_cov/plugin.py", line 145, in __init__
    self.start(engine.Central)
  File "/home/akhelesh/.local/lib/python3.6/site-packages/pytest_cov/plugin.py", line 167, in start
    self.cov_controller.start()
  File "/home/akhelesh/.local/lib/python3.6/site-packages/pytest_cov/engine.py", line 159, in start
    self.cov.erase()
  File "/home/akhelesh/.local/lib/python3.6/site-packages/coverage/control.py", line 717, in erase
    self._init()
  File "/home/akhelesh/.local/lib/python3.6/site-packages/coverage/control.py", line 219, in _init
    self.plugins = Plugins.load_plugins(self.config.plugins, self.config, self.debug)
  File "/home/akhelesh/.local/lib/python3.6/site-packages/coverage/plugin_support.py", line 39, in load_plugins
    __import__(module)
  File "/home/akhelesh/.local/lib/python3.6/site-packages/coverage_env_plugin.py", line 4, in <module>
    from packaging.markers import default_environment
ModuleNotFoundError: No module named 'packaging'

(coala) akhelesh@Hubble:/media/Vol-B/Projects/coala-bears$ pip install packaging
Requirement already satisfied: packaging in /home/akhelesh/.conda/envs/coala/lib/python3.6/site-packages
Requirement already satisfied: six in /home/akhelesh/.local/lib/python3.6/site-packages (from packaging)
Requirement already satisfied: pyparsing in /home/akhelesh/.local/lib/python3.6/site-packages (from packaging