Setting up a simple python app with pytest getting error NameError and AttributeError

Question

I wanted to get advice on the best way to setup a simple app with pytest.

I can run pytest fine on a single file but I wanted to bootstrap a Python app using:

mypkg/
    __init__.py
    app.py
tests/
    __init__.py
    test_app.py

But when I run pytest I get an error:

NameError: name 'func' is not defined

mypkg/__init__.py file

# content of __init__.py
# Empty init file

mypkg/app.py file

# content of app.py
class mypkg:
    def func(x):
        return x + 1

tests/__init__.py file

# content of __init__.py
# Empty init file

tests/test_app.py file

# content of test_app.py
import pytest
import mypkg

def test_answer():
    assert func(4) == 5

I'm using Python 3.5.

Do I need a setup.py and if I try calling mypkg.func(4) instead I get an AttributeError: modulemypkghas no attribute 'func'.

Any help is much appreciated.

Daniel Roseman · Accepted Answer · 2017-03-21 16:25:03Z

2

This question has nothing to do with pytest, or with testing at all. It is a fundamental rule in Python that if you want to access a name you need to import it; you haven't imported func, so it gives a name error.

However, for some reason you have defined func as part of a class. You cannot import a method separately from its class; but, there is no reason for that to be a method in a class at all. Just define it as a standalone function, and import that.

Note, even standing on its own, func is inside app, not directly inside mypkg. So you need to import it where it actually is.

from mypkg.app import func

answered Mar 21, 2017 at 16:25

Daniel Roseman

602k68 gold badges910 silver badges923 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Wasabi Developer Over a year ago

Thanks Daniel :) I understand now that the period between mypkg and app = the directory mypkg/app. Also, I've remove the class and have the method stands alone now.

mic4ael · Accepted Answer · 2017-03-21 16:25:42Z

0

You declared func inside mypkg class that resides inside mypkg/app.py module, thus you need to rewrite your tests as follows

# content of test_app.py
import pytest
import mypkg

def test_answer():
    obj = mypkg.app.mypkg()
    assert obj.func(4) == 5

answered Mar 21, 2017 at 16:25

mic4ael

8,4304 gold badges32 silver badges44 bronze badges

Collectives™ on Stack Overflow

Setting up a simple python app with pytest getting error NameError and AttributeError

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related