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?
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.