Flask - cannot start application on Windows

[jasmingoh]

To reproduce: (on dev branch)
Install python 2.7 and 3.7 on your computer
Create a Flask application on Windows
In the generated application, run yarn install and yarn start

Note: py -3 command works

[jsondoo]

Was this happening on dev or #792 ?

It seems like it's working for me on both without any errors

[jasmingoh]

@jsondoo it happens when I was on this branch: garage/t-nijind/varFuncNames

Just tested on the dev branch, seems like it is only happening when I select other pages (e.g. list, master detail and grid)

[jsondoo]

@jasmingoh I gave dev a try again, and it works with adding list items, grid, master details. I tried with python 3.7 with Cosmos MongoDB

[streetcoder123]

@jsondoo As discussed with @jasmingoh, the problem seems to be occurring if the user has both Python 2 and Python 3 installed. In this case, python command is defaulted to python version 2. To run version 3, you need to run python launcher py -3.
A simple solution would be to add another script for booting up python server through python launcher but that now looks to me like a hack.
We need to come up with a more generalized solution.