I'm trying to learn flask. I've created a virtual environment (venv) in my project directory (C:\users\ian\git\flasktutorial). FLASK_APP is set to flasktutorial, FLASK_DEBUG=1, and I do have a flasktutorial.py in the directory.
When I type "flask run" I get the following:
* Serving Flask app "flasktutorial"
* Forcing debug mode on
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
* Restarting with windowsapi reloader
c:\users\ian\git\flasktutorial\venv\scripts\python.exe: can't open file 'C:\users\Ian\Git\flasktutorial\venv\Scripts\flask': [Errno 2] No such file or directory
Run flask as a module, then the reloader will work on Windows:
python -m flask run
When starting the app in Windows with
flask.exe then the reloader constructs wrong args for the new subprocess. Source code here.
It tries to run the python interpreter with
flask.exe as script name, but without the extension, this is the the reason for the file not found error.
If you make a dupe and copy Scripts/flask.exe to Scripts/flask then it will work. ;)
Otherwise, when running flask as a module then the sys.argv contains proper paths for the reloader to run the subprocess.