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

I had got the same issue while running the first hello world for flask.

Ideally there should not be any space between so use set FLASK_APP=run.py

Answer 2

Different shell programs have different ways to set the environment variable in it. So that Flask can discover you application correctly.

• Unix Bash/Zsh (Linux, Mac, etc.):

  $ export FLASK_APP=hello
  $ flask run
  

• Windows CMD:

  > set FLASK_APP=hello
  > flask run
  

• Windows PowerShell:

  > $env:FLASK_APP = "hello"
  > flask run
  

You can find more infomation in the Flask docs.

Answer 3

    > set FLASK_APP=Your_file_name.py
    > set FLASK_ENV=development
    > flask run

it must be work for windows user only

Answer 4

I had the same issue on windows and found a solution from the flask documentation: https://flask.palletsprojects.com/en/1.1.x/tutorial/factory/

My file structure: Flask_folder>>app

(NB! app folder contains: __init_.py and routes.py)

> set FLASK_APP=app

> set FLASK_ENV=development

> flask run

Answer 5

I fixed the same problem by closing the command window and restart it.

Answer 6

Did you run your terminal as administrator? I had the same problem, and running cmd/PowerShell as admin fixed it for me.

Edit: I spoke too soon. Running as admin did nothing.

The real answer (to my problem, at least) is a combination of some of the other answers.

1. Instead of using set FLASK_APP = myApp.py, use setx FLASK_APP myApp.py
2. Restart the terminal, and FLASK_APP will have the new value