flask run does not work but python server.py does! Environment vars set

Question

When I try to run my very simple Flask application using flask run it does not work but when I cd src and python server.py it does work.

File structure:

my_project
|____init__.py
|
|__src
|  |____init__.py
|  |__server.py
|  |__chat.py
|
|__test
|  |____init__.py
|  |__test_server.py
|  |__test_chat.py
|
|__FLASK_ENV_VARS.sh

server.py

from flask import Flask, jsonify
import chat

api = Flask(__name__)


@api.route('/')
def root():
    message = chat.say_hello()
    return jsonify(message=message)


if __name__ == '__main__':
    api.run(debug=True)

In order to get the tests to pass, I need to from src import chat . When I leave it as import chat the server runs when I try python server.py but not flask run (which doesn't run either way of importing chat). Interestingly, I get a red squggly line under chat from my IDE when import chat that goes away with from src import chat .

test_server.py

import pytest


from src.server import api


def test_route(client):
    response = client.get('/')
    assert response.status_code == 200
    expected_data = b'{"message":"Welcome message here"}\n'
    assert response.data == expected_data



@pytest.fixture
def client():
    api.testing = True
    client = api.test_client()
    return client 

The content of the environment variables shell script is

export FLASK_ENV=development
export FLASK_DEBUG=1
export FLASK_APP=server.py

I have tried making FLASK_APP both src.server.py and server.py , neither currently works. Of course I remember to run the shell script and echo the variables to ensure that they have changed.

The error I get from flask run is flask.cli.NoAppException: Could not import "my_project.server".

When I cd src and flask run I get flask.cli.NoAppException: While importing "my_project.src.server", an ImportError was raised:

The problem, I suspect lies with the way chat is imported. The tests only run with from src import chat . When I run python server.py I have to have only import chat or it doesn't work. I get ModuleNotFoundError: No module named 'chat' as part of the stack trace or ModuleNotFoundError: No module named 'src' depending on which style of import was used. I'm not sure what I am getting wrong here. I am inclined to think that from src import chat is correct since this is what makes the tests pass, however I can't get this to work at all.

Answer 1

Did you try $env:FLASK_APP = "server.py"

try Something like this too , export FLASK_APP=my_project/src/server.py; flask run export FLASK_APP=my_project/src/server.py; flask run

You can also mention app = Flask (__name__) in __init__.py and then execute flask run

Answer 2

通过将server.py中有问题的导入更改为

from my_project.src import chat