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I'm developing a REST API, using flask and flask-restful. I am currently having problems with flask-cli, since in the company environment I can not run with the application. What may be the problem?

In the enterprise, we use conda environments, for python 3 applications. Currently the environment for api consists of python 3.6.8 with flask 1.0.2 and flask-restful 0.37, running on a CentOS 7. Even recreating the environment by requirements or enviroment.yml of the conda, I could not run the application, different from my personal machine that is an ubuntu 18.04, with miniconda3 and env python 3.6.8, with the same flask packages and I can test without problems.

Error:

 File "/home/user/opt/miniconda3/envs/comands/lib/python3.6/site-packages/flask/cli.py", line 235, in locate_app __import__(module_name) ModuleNotFoundError: No module named 'main' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/home/user/opt/miniconda3/envs/comands/lib/python3.6/site-packages/flask/cli.py", line 325, in __call__ self._flush_bg_loading_exception() File "/home/user/opt/miniconda3/envs/comands/lib/python3.6/site-packages/flask/cli.py", line 313, in _flush_bg_loading_exception reraise(*exc_info) File "/home/user/opt/miniconda3/envs/comands/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise raise value File "/home/user/opt/miniconda3/envs/comands/lib/python3.6/site-packages/flask/cli.py", line 302, in _load_app self._load_unlocked() File "/home/user/opt/miniconda3/envs/comands/lib/python3.6/site-packages/flask/cli.py", line 317, in _load_unlocked self._app = rv = self.loader() File "/home/user/opt/miniconda3/envs/comands/lib/python3.6/site-packages/flask/cli.py", line 372, in load_app app = locate_app(self, import_name, name) File "/home/user/opt/miniconda3/envs/comands/lib/python3.6/site-packages/flask/cli.py", line 246, in locate_app 'Could not import "{name}".'.format(name=module_name) flask.cli.NoAppException: Could not import "main".

Script Main:

 from app import create_app, db from flask_migrate import Migrate app = create_app('development') Migrate(app,db) @app.shell_context_processor def shell_context(): return dict( app = app, db=db )

Script init.py:

 from flask_restful import Api from flask import Flask from flask_sqlalchemy import SQLAlchemy from config import config db = SQLAlchemy() def create_app(config_name): app = Flask(__name__) app.config.from_object(config[config_name]) api=Api(app, prefix="/api/v1") db.init_app(app) from app.resources.catcherDicts import Catcher api.add_resource(Catcher, "/catcher") return app

I wan to be able to run the tests and run the application in the company environment. Because even exporting the application path with export FLASK_APP = main.py command flask run cannot run the application.

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The error:

ModuleNotFoundError: No module named 'main'

is telling you it can't find the main.py module from your cli.py module. This is happening because you set your entry point to your application as main.py with this line of code: export FLASK_APP = main.py. I suspect this environment variable is incorrect, I would try running your entry file directly and seeing if it works, if so your environment variable is incorrect. Additionally, ensure your <path> is set appropriately if you're not running the file from the directory containing your entry point otherwise flask run will not work.

Hopefully that helps!

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4 Comments

Many thanks Nathan, you're correct, in fact my problem is being in the moment that I inform you the location of the main.py script. Based on the documentation, it is not clear that I need to enter the full path to environment variable. Soon I was only informing the location of the script and running flask run inside the folder, but it still would not run the application. With your solution, I needed to enter the full path and now it worked! Many thanks for the reply.
Please Nathan, add this information, insert the full path, for when others are reading this doubt. Thank you for your help.
Np glad you were able to get it to work! Just added the part about the path :)
I had the same issue, but it was with a environment. I uinstall Flask, and MySQL and install it again with and updgraded subversion. It worked for me.

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