Pytest无法导入第三方软件包

Question

所以我坚持使用pytest。我的设置是带有docker-compose的django安装程序。每当我运行pytest时，都会出现这样的错误

Hint: make sure your test modules/packages have valid Python names.
Traceback:
lib/python3.6/site-packages/compressor/tests/test_signals.py:4: in <module>
    from mock import Mock
E   ModuleNotFoundError: No module named 'mock'

另一个

 E   _pytest.config.ConftestImportFailure: (local('/app/lib/python3.6/site-packages/testfixtures/tests/conftest.py'), (<class 'ModuleNotFoundError'>, ModuleNotFoundError("No module named 'sybil'"), <traceback object at 0x7fb8a7a4e780>))

似乎在导入第三方库时遇到问题，我该如何忽略此类错误。