[Solved] Pytest Error: ImportError: Error importing plugin '': No module named ...

Problem:

Running into the following error when trying to run a Pytest test suite in a Python application via the pytest command:

 File "/usr/lib/python2.7/dist-packages/_pytest/helpconfig.py", line 94, in pytest_cmdline_parse
    config = outcome.get_result()
  File "/usr/lib/python2.7/dist-packages/pluggy/callers.py", line 81, in get_result
    _reraise(*ex)  # noqa
  File "/usr/lib/python2.7/dist-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/usr/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 739, in pytest_cmdline_parse
    self.parse(args)
  File "/usr/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 947, in parse
    self._preparse(args, addopts=addopts)
  File "/usr/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 889, in _preparse
    self.pluginmanager.consider_preparse(args)
  File "/usr/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 499, in consider_preparse
    self.consider_pluginarg(parg)
  File "/usr/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 524, in consider_pluginarg
    self.import_plugin(arg, consider_entry_points=True)
  File "/usr/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 574, in import_plugin
    six.reraise(ImportError, new_exc, tb)
  File "/usr/lib/python2.7/dist-packages/_pytest/config/__init__.py", line 565, in import_plugin
    __import__(importspec)
ImportError: Error importing plugin "sklearn.tests.random_seed": No module named sklearn.tests.random_seed

Solution:

There are a number of potential causes for this issue, the most likely being that the PYTHONPATH environment variable not being defined in your ~/.profile file. There are two potential solutions you can try here:

1. Define the PYTHONPATH environment variable by running the command export PYTHONPATH=<your_user_defined_module_path_here>. Then retry running pytest
2. Add the prefix python -m before the usual pytest command like so: python -m pytest

Conclusion

Well this is the end of the article, if you have any questions or concerns please feel free to post a comment in this article and I will get back to you if I find the time.

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