Flask AttributeError: module 'app' has no attribute 'run'

Question

My Flask project is structured as follows:

my_project
│
├── app
│   ├── __init__.py
│   ├── api
│   ├── static
│   └── templates
├── config.py
└── run.py

app/__init__.py:

from flask import Flask

app = Flask(__name__)

app.config.from_object('config')

run.py

from app import app

app.run(
    host=app.config.get('HOST', '0.0.0.0'),
    port=app.config.get('PORT', 5000)
)

This worked before, but I'm trying to migrate my project from Python 2 to Python 3, and running python run.py no longer works. I get the following error:

Traceback (most recent call last):
  File "/Users/rasmi/Projects/my_project/run.py", line 3, in <module>
    app.run(
AttributeError: module 'app' has no attribute 'run'

If I change the import style in run.py to match the one here:

from .app import app

app.run(
    host=app.config.get('HOST', '0.0.0.0'),
    port=app.config.get('PORT', 5000)
)

I get a different error:

Traceback (most recent call last):
  File "/Users/rasmi/Projects/my_project/run.py", line 1, in <module>
    from .app import app
ModuleNotFoundError: No module named '__main__.app'; '__main__' is not a package

Wrapping my app.run() call in an if __name__ == '__main__': block yields the same results. What's causing this issue?

Community · Accepted Answer · 2017-05-23 10:29:38Z

16

I fixed this issue by renaming the app directory to something else (e.g. webapp). Using from webapp import app does the trick. This seems to be because package directory names take precedence over module names when importing. Perhaps using __path__ would allow one to get around this.

edited May 23, 2017 at 10:29

CommunityBot

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answered Jan 15, 2017 at 0:34

rasmi

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Comments

ProgrammingPete · Accepted Answer · 2020-05-12 03:12:23Z

3

I solved this issue by doing this in my runserver.py:

from WebApp import app 
app.app.run(debug=True)

Where the name of the package is Webapp. Noticed how I used app twice. Also, my Flask app is called app.

├── WebApp
│   ├── app.py
│   ├── authentication.py
│   ├── __init__.py
│   ├── models.py
├── runserver.py

answered May 12, 2020 at 3:12

ProgrammingPete

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Comments

Omkar · Accepted Answer · 2020-03-08 05:59:21Z

2

I was facing same issue for below line in my app,

import app.main.constant.constants as Constants

but then I restructure above command to below, and It worked for me.

from app.main.constant import constants as Constants

answered Mar 8, 2020 at 5:59

Omkar

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Comments

abduljalil · Accepted Answer · 2021-11-09 08:53:17Z

1

can you change your from app import app1 to from app import *?

it worked for me

<code>
├── app
│   ├── __init__.py
│   ├── viewss.py
├── run.py
</code>

I was trying to import app from app/init__.py in run.py

answered Nov 9, 2021 at 8:53

abduljalil

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