python - Py.test No module named *

Question

I have a folder structure like this

App
--App
  --app.py       
--Docs
--Tests
  --test_app.py

In my test_app.py file, I have a line to import my app module. When I run py.test on the root folder, I get this error about no module named app. How should I configure this?

Answer 1

So you are running py.test from /App. Are you sure /App/App is in your $PYTHONPATH?

If it's not, code that tries to import app will fail with such a message.

EDIT0: including the info from my comment below, for completeness.

An attempt to import app will only succeed if it was executed inside /App/App, which is not the case here. You probably want to make /App/App a package by putting __init__.py inside it, and change your import to qualify app as from App import app.

EDIT1: by request, adding further explanation from my second comment below.

By putting __init__.py inside /App/App, that directory becomes a package. Which means you can import from it, as long as it - the directory - is visible in the $PYTHONPATH. I.e. you can do from App import app if /App is in the $PYTHONPATH. Your current working directory gets automatically added to $PYTHONPATH, so when you run a script from /App, the import will work.

Answer 2

Working with Python 3 and getting the same error on a similar project layout, I solved it by adding an __init__ file to my tests module.

$ touch tests/__init__.py

I'm not great at packaging and importing, but I think that this helps pytest work out where the target App module is located.

Answer 3

I already had an __init__.py file in the /App/App directory and wanted to run tests from the project root without any path-mangling magic:

 python -m pytest tests

The output immediately looks like this:

➟  python -m pytest tests
====================================== test session starts ======================================
platform linux -- Python 3.5.1, pytest-2.9.0, py-1.4.31, pluggy-0.3.1
rootdir: /home/andrew/code/app, inifile: 
plugins: teamcity-messages-1.17
collected 46 items 

... lines omitted ...

============================= 44 passed, 2 skipped in 1.61 seconds ==============================

Answer 4

I had a similar problem and had to delete __init__.py from the root and add an __init__.py to the tests folder.

Answer 5

I also got same error while running test cases for my app located as below

myproject
  --app1
    --__init.py__
    --test.py
  --app2
    --__init.py__
    --test.py
  --__init.py__

I deleted my myproject's init.py file to run my test cases.

Answer 6

Running pytest with the python -m pytest command helps with this exact thing.

Since your current package is not yet in your $PYTHONPATH or sys.path - pytest gets this error.

By using python -m pytest you automatically add the working directory into sys.path for running pytest. Their documentation also mentions:

This is almost equivalent to invoking the command line script pytest

Answer 7

I got the similar issue. And after trying multiple things including installing pytest on virtual environment and adding/removing __init__.py file from the package, none worked for me.

Solution that worked for me is(windows solution): Added Project folder(not package folder) to python path(set PYTHONPATH=%PYTHONPATH%;%CD%)

Ran my script from Project Folder and boom, it worked.

Answer 8

This worked for me: Went to parent app, and pip install -e . (install a local and editable app).