We using **py.test**. We try to put different `conftest.py` files in different folders to split our fixtures:

```
tests/api/
├── conftest.py
├── folder1
│   └── conftest.py
├── folder2
│   └── conftest.py

```

But when run the tests this error occurs:

```
____ ERROR collecting api/folder1/conftest.py ____
import file mismatch:
imported module 'conftest' has this __file__ attribute:
  /tests/api/folder2/conftest.py
which is not the same as the test file we want to collect:
  /tests/api/folder1/conftest.py
HINT: remove __pycache__ / .pyc files and/or use a unique basename for your test file modules

```

Why is that? How fix it?

PS. Removing `__pycache__.pyc` did not help.

PPS. `__init__.py` files already exist in each folder.