我想在 PyCharm 中使用 pytest 和 pytest-cov 插件，所以我--cov=package在编辑配置时添加了“附加参数”输入字段。但是，我得到了输出和错误，不知道为什么：
Testing started at 4:50 PM ...
/home/alex/.repos/codelib/github/dsa/env/bin/python /home/alex/Downloads/pycharm-2019.3.4/plugins/python/helpers/pycharm/_jb_pytest_runner.py --path /home/alex/.repos/codelib/github/dsa/ -- --cov=bag
Launching pytest with arguments --cov=bag /home/alex/.repos/codelib/github/dsa/ in /home/alex/.repos/codelib/github/dsa/bag/tests
============================= test session starts ==============================
platform linux -- Python 3.6.9, pytest-5.4.1, py-1.8.1, pluggy-0.13.1 -- /home/alex/.repos/codelib/github/dsa/env/bin/python
cachedir: .pytest_cache
rootdir: /home/alex/.repos/codelib/github/dsa
plugins: cov-2.8.1
collecting ... collected 1 item
test_simple_bag.py::test_len PASSED [100%]
Coverage statistics reporting failed
Traceback (most recent call last):
File "/home/alex/Downloads/pycharm-2019.3.4/plugins/python/helpers/pycharm/teamcity/pytest_plugin.py", line 371, in pytest_terminal_summary
self._report_coverage()
File "/home/alex/Downloads/pycharm-2019.3.4/plugins/python/helpers/pycharm/teamcity/pytest_plugin.py", line 378, in _report_coverage
from coverage.report import Reporter
ImportError: cannot import name 'Reporter'
----------- coverage: platform linux, python 3.6.9-final-0 -----------
Name Stmts Miss Cover
----------------------------------------------------------------------------
/home/alex/.repos/codelib/github/dsa/bag/__init__.py 0 0 100%
/home/alex/.repos/codelib/github/dsa/bag/simple_bag.py 17 5 71%
__init__.py 0 0 100%
test_simple_bag.py 6 0 100%
----------------------------------------------------------------------------
TOTAL 23 5 78%
============================== 1 passed in 0.03s ===============================
Process finished with exit code 0
当我从终端运行测试时，一切正常：
(env) alex@smartalex-pc:~/.repos/codelib/github/dsa$ pytest --cov=bag
============================================== test session starts ===============================================
platform linux -- Python 3.6.9, pytest-5.4.1, py-1.8.1, pluggy-0.13.1
rootdir: /home/alex/.repos/codelib/github/dsa
plugins: cov-2.8.1
collected 1 item
bag/tests/test_simple_bag.py . [100%]
----------- coverage: platform linux, python 3.6.9-final-0 -----------
Name Stmts Miss Cover
--------------------------------------------------
bag/__init__.py 0 0 100%
bag/simple_bag.py 17 5 71%
bag/tests/__init__.py 0 0 100%
bag/tests/test_simple_bag.py 6 0 100%
--------------------------------------------------
TOTAL 23 5 78%
=============================================== 1 passed in 0.03s ================================================
(env) alex@smartalex-pc:~/.repos/codelib/github/dsa$