ImportError while loading conftest

[Akopov4]

Type: Bug

In my project I have a folder helpers. There is a python file db.py. There is a class called Database.
In the same level as folders helpers i have file conftest.py . In conftest I import Database class.
"from .helpers.db import DataBase" . There are no errors shown in the conftest.py file.
But when I run tests discovery, I get an error:

Test loading failed: Error: Process exited with code 4: ImportError while loading conftest '/home/akop/PythonProjects/playwright_qa_mamania/conftest.py'.
conftest.py:7: in <module>
    from .helpers.db import DataBase
E   ImportError: attempted relative import with no known parent package

Error: Process exited with code 4: ImportError while loading conftest '/home/akop/PythonProjects/playwright_qa_mamania/conftest.py'.
conftest.py:7: in <module>
    from .helpers.db import DataBase
E   ImportError: attempted relative import with no known parent package

    at ChildProcess.<anonymous> (/home/akop/.vscode/extensions/littlefoxteam.vscode-python-test-adapter-0.8.2/out/src/processRunner.js:27:32)
    at Object.onceWrapper (node:events:632:26)
    at ChildProcess.emit (node:events:517:28)
    at ChildProcess.emit (node:domain:489:12)
    at maybeClose (node:internal/child_process:1098:16)
    at Socket.<anonymous> (node:internal/child_process:450:11)
    at Socket.emit (node:events:517:28)
    at Socket.emit (node:domain:489:12)
    at Pipe.<anonymous> (node:net:350:12)

Extension version: 2024.4.0
VS Code version: Code 1.88.0 (5c3e652f63e798a5ac2f31ffd0d863669328dc4c, 2024-04-03T13:25:57.039Z)
OS version: Linux x64 5.15.0-102-generic
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz (4 x 2500)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off
Load (avg)	4, 4, 3
Memory (System)	11.56GB (2.59GB free)
Process Argv	--unity-launch --crash-reporter-id 01400cc3-0ed1-484c-a547-9fad9bdfb52d
Screen Reader	no
VM	0%
DESKTOP_SESSION	cinnamon
XDG_CURRENT_DESKTOP	X-Cinnamon
XDG_SESSION_DESKTOP	cinnamon
XDG_SESSION_TYPE	x11

A/B Experiments

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pythonait:31006305
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[karthiknadig]

@Akopov4 Relative imports work differently based on where you are running from and what you are using to run. Wehn you open conftest.py, it is as if you are running that file, from the context of that file, the imports can get resolved. But, typically conftest gets loaded into pytest and this can mean that it is looking for a __init__.py that it can use as a reference package to find the .helpers.db.

Please provide how you have organized your code, so we can help with this.

[Akopov4]

[Akopov4]

@karthiknadig please look my gif

[Akopov4]

@eleanorjboyd please look my gif

[karthiknadig]

Does it work if you run pytest from terminal? Just run pytest tests?

[Akopov4]

i don't run pytest. I just hit the button to discover tests

[karthiknadig]

I understand that you use the run button. But I want to know if it works from the terminal. When you run it from terminal does it execute as expected or do you get error?

[Akopov4]

I don't use run button. I use button - Test Explorer: Reload Tests

[Akopov4]

There problem was in "dot":
from .helpers.db import DataBase
Without "dot" everything works ok:
from helpers.db import DataBase

• but it is strange

[ssbarnea]

We should reopen this bug because is genuine. I was able to encounter it myself while my python environment is fine and I suspect that I found some of the causes.

This is output from Extension Host and it surprisingly includes ANSI escapes, reason for likely being the fact that I have PY_COLORS=1 added to my user environment. I think that pytest adapter must explicitely disable ANSI output if it does not support it (or strip them), so environment variables would not confuse it.

2024-04-29 14:59:51.590 [error] Error: �[31mImportError while loading conftest '/Users/ssbarnea/c/a/ansible-lint/test/conftest.py'.�[0m
�[31m�[1m�[31mtest/conftest.py�[0m:13: in <module>�[0m
�[31m    �[0m�[94mfrom�[39;49;00m �[04m�[96mansiblelint�[39;49;00m�[04m�[96m.�[39;49;00m�[04m�[96mtesting�[39;49;00m�[04m�[96m.�[39;49;00m�[04m�[96mfixtures�[39;49;00m �[94mimport�[39;49;00m *  �[90m# noqa: F403�[39;49;00m�[90m�[39;49;00m�[0m
�[31m�[1m�[31msrc/ansiblelint/testing/__init__.py�[0m:13: in <module>�[0m
�[31m    �[0m�[94mfrom�[39;49;00m �[04m�[96mansiblelint�[39;49;00m�[04m�[96m.�[39;49;00m�[04m�[96mapp�[39;49;00m �[94mimport�[39;49;00m get_app�[90m�[39;49;00m�[0m
�[31m�[1m�[31msrc/ansiblelint/app.py�[0m:17: in <module>�[0m
�[31m    �[0m�[94mfrom�[39;49;00m �[04m�[96mansiblelint�[39;49;00m �[94mimport�[39;49;00m formatters�[90m�[39;49;00m�[0m
�[31m�[1m�[31msrc/ansiblelint/formatters/__init__.py�[0m:13: in <module>�[0m
�[31m    �[0m�[94mfrom�[39;49;00m �[04m�[96mansiblelint�[39;49;00m�[04m�[96m.�[39;49;00m�[04m�[96mconfig�[39;49;00m �[94mimport�[39;49;00m options�[90m�[39;49;00m�[0m
�[31m�[1m�[31mE     File "/Users/ssbarnea/c/a/ansible-lint/src/ansiblelint/config.py", line 181�[0m�[0m
�[31m�[1m�[31mE       return return bool(int(os.environ.get("ANSIBLE_LINT_NODEPS", "0")))�[0m�[0m
�[31m�[1m�[31mE              ^^^^^^�[0m�[0m
�[31m�[1m�[31mE   SyntaxError: invalid syntax�[0m�[0m

Traceback (most recent call last):
  File "/Users/ssbarnea/.vscode/extensions/ms-python.python-2024.4.1/python_files/testing_tools/run_adapter.py", line 22, in <module>
    main(tool, cmd, subargs, toolargs)
  File "/Users/ssbarnea/.vscode/extensions/ms-python.python-2024.4.1/python_files/testing_tools/adapter/__main__.py", line 97, in main
    parents, result = run(toolargs, **subargs)
                      ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ssbarnea/.vscode/extensions/ms-python.python-2024.4.1/python_files/testing_tools/adapter/pytest/_discovery.py", line 47, in discover
    raise Exception("pytest discovery failed (exit code {})".format(ec))
Exception: pytest discovery failed (exit code 4)

Note: the file does not really have a syntax error, python runs it quite fine. Still, the way vscode is trying to load it makes it throw this weird error. I suspect that the import at the beginning of the file does not work and that is later causing a syntax error when trying to call.

[eleanorjboyd]

Hi! The issue with the syntax error and coloration will be fixed as part of this issue: #21845 it is a known problem that it works in the test result panel (during run) but not in the python output panel (output for error / discovery)

Secondly I am seeing you are using the old testing architecture: File "/Users/ssbarnea/.vscode/extensions/ms-python.python-2024.4.1/python_files/testing_tools/adapter/pytest/_discovery.py", line 47, in discover. Could you update to our rewrite and try again? You can do so adding this setting to your users settings.json "python.experiments.optInto": ["pythonTestAdapter"]. Then you can confirm its enabled by finding Experiment 'pythonTestAdapter' is active in your python logs. If you are unable to see the log for the experiment change your log level to trace and it should show up.
To set to trace use theDeveloper: set log level command in the command palette. Thanks

[Akopov4]

@eleanorjboyd @ssbarnea I have created new defect, because this one was closed. I attached there gif file. I hope it will make issue clear #23328