flask app start error

[Arcahub]

Bug report

Description

Flask back won't start if python2 installed and dependencies error

To Reproduce

Steps to reproduce the behavior:

1. npm run flask:back with python2 installed

Expected behavior

The app should run

Environment

yarn run v1.22.0
$ tools/print-envs/index.bash
node --version
v10.19.0
npm --version
6.13.4
yarn --version
1.22.0
yarn run ng --version
$ ng --version

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/

Angular CLI: 9.0.4
Node: 10.19.0
OS: linux x64

Angular: 9.0.4
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.900.4
@angular-devkit/build-angular      0.900.1
@angular-devkit/build-ng-packagr   0.900.4
@angular-devkit/build-optimizer    0.900.1
@angular-devkit/build-webpack      0.900.1
@angular-devkit/core               9.0.4
@angular-devkit/schematics         9.0.4
@angular-devkit/schematics-cli     0.13.8
@angular/cdk                       9.1.0
@angular/material                  9.1.0
@ngtools/webpack                   9.0.1
@schematics/angular                9.0.4
@schematics/schematics             0.13.8
@schematics/update                 0.900.4
ng-packagr                         9.0.2
rxjs                               6.5.4
typescript                         3.7.5
webpack                            4.41.2

python --version
Python 2.7.17
pip --version
pip 19.0.3 from /usr/lib/python2.7/site-packages/pip (python 2.7)