Env. Variables not set while running Minimal Flask application

Question

I am trying to follow the flask documentation on my windows machine given at the following link: http://flask.pocoo.org/docs/0.11/quickstart/#debug-mode

Firstly I wrote

Answer 1

1. export FLASK_APP=run.py
2. flask run --host=0.0.0.0

then can run normally, output something like:

 * Serving Flask app "hello"
 * Forcing debug mode on
 * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger pin code: 353-795-063

Answer 2

I faced the same issue while using PowerShell and that fix worked for me:
instead of using set FLASK_APP = run.py, try $env:FLASK_APP = "run.py"

Answer 3

Your code is correct. Try setting the Command-Line variable like this :

setx FLASK_APP run.py

And then run it : flask run.

Answer 4

You have to set the FLASK_APP variable outside of the virtual environment. I'm assuming the reason that it worked after @Fang restarted the command window is because that action automatically exited the virtual environment.

So, if you're in the virtual environment (indicated by a (venv) at the start of line on command window), then type the following commands:

deactivate

set FLASK_APP=run.py

venv\scripts\activate

flask run

Answer 5

Success with setx FLASK_APP test.py . Note: if not run, close command line and start other one.

D:\projects\flask-oauthlibpy2>.evn\Scripts\activate

(.evn) D:\projects\flask-oauthlibpy2>setx FLASK_APP test.py

SUCCESS: Specified value was saved.

(.evn) D:\projects\flask-oauthlibpy2>flask run
 * Serving Flask app "flask-oauthlibpy2.test"
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [24/May/2017 14:35:06] "GET / HTTP/1.1" 200 -

Answer 6

Here is what worked for me:

• Step 1: Open your CMD Command prompt
• Step 2: Go on the same directory in which my python file was on.
• Step 3: in the CMD command prompt run the command setx FLASK_APP sqlAlchemy.py
• Step 4: close terminal
• Step 5: In the CMD command prompt run the command python - m flask run

I have an Alienware laptop and am using Windows 10.

Not sure it worked but it was a combination of trial and ever. Depending on the OS you have the solution will vary it seems. IT could be an environmental variable issue but again not sure.

- Here are other possible solutions that didn't work for me but I gathered them up as possibilities.

• OPTION 2
• set FLASK_APP=sqlalchemy.py
  • flask run
• OPTION 3
• set FLASK_APP=app
• set FLASK_ENV=development
  • flask run Hope this helps.