For my situation, I found what the problem is:
If there is --cov in pytest.ini, then breakpoints in pycharm won’t work, after deleting all --cov in pytest.ini, the breakpoints in pycharm can work.
Reason:
“The coverage module and pycharm’s debugger use the same tracing api (sys.settrace) – they don’t work together. ” — https://github.com/pytest-dev/pytest-cov/issues/131
References:
How to debug py.test in PyCharm when coverage is enabled