Error when running 'quasar upgrade -i': "Can't find Python executable"

I run quasar upgrade -i Here’s what I get:

c:\projects\my-app>quasar upgrade -i

  Quasar CLI · Gathering information with yarn...

 quasar: 1.2.2 → 1.2.6
 @quasar/app: 1.2.1 → 1.2.2

  Quasar CLI · Running "yarn add quasar@^1.2.6"

yarn add v1.19.1
[1/5] Validating package.json...
[2/5] Resolving packages...
[3/5] Fetching packages...
info fsevents@2.1.1: The platform "win32" is incompatible with this module.
info "fsevents@2.1.1" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.9: The platform "win32" is incompatible with this module.
info "fsevents@1.2.9" is an optional dependency and failed compatibility check. Excluding it from installation.
[4/5] Linking dependencies...
warning " > emoji-mart-vue-fast@6.1.2" has unmet peer dependency "vue@^2.0.0".
warning "emoji-mart-vue-fast > vue-virtual-scroller@1.0.0-rc.2" has unmet peer dependency "vue@^2.5.21".
warning "emoji-mart-vue-fast > vue-virtual-scroller > vue-resize@0.4.5" has unmet peer dependency "vue@^2.3.0".
warning "@quasar/quasar-app-extension-qmarkdown > raw-loader@3.1.0" has unmet peer dependency "webpack@^4.3.0".
warning " > eslint-loader@3.0.2" has unmet peer dependency "webpack@^4.0.0".
warning " > eslint-plugin-vue@5.2.3" has incorrect peer dependency "eslint@^5.0.0".
warning "eslint-plugin-vue > vue-eslint-parser@5.0.0" has incorrect peer dependency "eslint@^5.0.0".
[5/5] Building fresh packages...
[-/4] ⠄ waiting...
[-/4] ⠄ waiting...
[-/4] ⠄ waiting...
error c:\projects\my-app\node_modules\node-sass: Command failed.
Exit code: 1
Command: node scripts/build.js
Arguments:
Directory: c:\projects\my-app\node_modules\node-sass
Output:
Building: C:\Program Files\nodejs\node.exe c:\projects\my-app\node_modules\node-gyp\bin\node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=
gyp info it worked if it ends with ok
gyp verb cli [
gyp verb cli   'C:\\Program Files\\nodejs\\node.exe',
gyp verb cli   'c:\\projects\\my-app\\node_modules\\node-gyp\\bin\\node-gyp.js',
gyp verb cli   'rebuild',
gyp verb cli   '--verbose',
gyp verb cli   '--libsass_ext=',
gyp verb cli   '--libsass_cflags=',
gyp verb cli   '--libsass_ldflags=',
gyp verb cli   '--libsass_library='
gyp verb cli ]
gyp info using node-gyp@3.8.0
gyp info using node@13.0.1 | win32 | x64
gyp verb command rebuild []
gyp verb command clean []
gyp verb clean removing "build" directory
gyp verb command configure []
gyp verb check python checking for Python executable "python2" in the PATH
gyp verb `which` failed Error: not found: python2
gyp verb `which` failed     at getNotFoundError (c:\projects\my-app\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (c:\projects\my-app\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (c:\projects\my-app\node_modules\which\which.js:80:29)
gyp verb `which` failed     at c:\projects\my-app\node_modules\which\which.js:89:16
gyp verb `which` failed     at c:\projects\my-app\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at c:\projects\my-app\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:158:21)
gyp verb `which` failed  python2 Error: not found: python2
gyp verb `which` failed     at getNotFoundError (c:\projects\my-app\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (c:\projects\my-app\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (c:\projects\my-app\node_modules\which\which.js:80:29)
gyp verb `which` failed     at c:\projects\my-app\node_modules\which\which.js:89:16
gyp verb `which` failed     at c:\projects\my-app\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at c:\projects\my-app\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:158:21) {
gyp verb `which` failed   stack: 'Error: not found: python2\n' +
gyp verb `which` failed     '    at getNotFoundError (c:\\projects\\my-app\\node_modules\\which\\which.js:13:12)\n' +
gyp verb `which` failed     '    at F (c:\\projects\\my-app\\node_modules\\which\\which.js:68:19)\n' +
gyp verb `which` failed     '    at E (c:\\projects\\my-app\\node_modules\\which\\which.js:80:29)\n' +
gyp verb `which` failed     '    at c:\\projects\\my-app\\node_modules\\which\\which.js:89:16\n' +
gyp verb `which` failed     '    at c:\\projects\\my-app\\node_modules\\isexe\\index.js:42:5\n' +
gyp verb `which` failed     '    at c:\\projects\\my-app\\node_modules\\isexe\\windows.js:36:5\n' +
gyp verb `which` failed     '    at FSReqCallback.oncomplete (fs.js:158:21)',
gyp verb `which` failed   code: 'ENOENT'
gyp verb `which` failed }
gyp verb check python checking for Python executable "python" in the PATH
gyp verb `which` failed Error: not found: python
gyp verb `which` failed     at getNotFoundError (c:\projects\my-app\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (c:\projects\my-app\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (c:\projects\my-app\node_modules\which\which.js:80:29)
gyp verb `which` failed     at c:\projects\my-app\node_modules\which\which.js:89:16
gyp verb `which` failed     at c:\projects\my-app\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at c:\projects\my-app\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:158:21)
gyp verb `which` failed  python Error: not found: python
gyp verb `which` failed     at getNotFoundError (c:\projects\my-app\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (c:\projects\my-app\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (c:\projects\my-app\node_modules\which\which.js:80:29)
gyp verb `which` failed     at c:\projects\my-app\node_modules\which\which.js:89:16
gyp verb `which` failed     at c:\projects\my-app\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at c:\projects\my-app\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:158:21) {
gyp verb `which` failed   stack: 'Error: not found: python\n' +
gyp verb `which` failed     '    at getNotFoundError (c:\\projects\\my-app\\node_modules\\which\\which.js:13:12)\n' +
gyp verb `which` failed     '    at F (c:\\projects\\my-app\\node_modules\\which\\which.js:68:19)\n' +
gyp verb `which` failed     '    at E (c:\\projects\\my-app\\node_modules\\which\\which.js:80:29)\n' +
gyp verb `which` failed     '    at c:\\projects\\my-app\\node_modules\\which\\which.js:89:16\n' +
gyp verb `which` failed     '    at c:\\projects\\my-app\\node_modules\\isexe\\index.js:42:5\n' +
gyp verb `which` failed     '    at c:\\projects\\my-app\\node_modules\\isexe\\windows.js:36:5\n' +
gyp verb `which` failed     '    at FSReqCallback.oncomplete (fs.js:158:21)',
gyp verb `which` failed   code: 'ENOENT'
gyp verb `which` failed }
gyp verb could not find "python". checking python launcher
gyp verb could not find "python". guessing location
gyp verb ensuring that file exists: C:\Python27\python.exe
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
gyp ERR! stack     at PythonFinder.failNoPython (c:\projects\my-app\node_modules\node-gyp\lib\configure.js:484:19)
gyp ERR! stack     at PythonFinder.<anonymous> (c:\projects\my-app\node_modules\node-gyp\lib\configure.js:509:16)
gyp ERR! stack     at callback (c:\projects\my-app\node_modules\graceful-fs\polyfills.js:295:20)
gyp ERR! stack     at FSReqCallback.oncomplete (fs.js:158:21)
gyp ERR! System Windows_NT 10.0.17763
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "c:\\projects\\my-app\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd c:\projects\my-app\node_modules\node-sass
gyp ERR! node -v v13.0.1
gyp ERR! node-gyp -v v3.8.0




  Quasar CLI · ⚠️  Command "yarn" failed with exit code: 1

Platform: OS: Windows 10 Yarn: 1.19.1

[apasov]

@ibrainventures Yes, I understand that this is an upstream package issue, not quasar itself. However, I posted it here because it happened when running quasar cli. I have never experienced any fatal errors using quasar cli before. So I think the solution you gave will be useful for those who can come across this situation while using quasar cli.

[ibrainventures]

may those tipps can help for the system setup ?:

npm --add-python-to-path=‘true’ --debug install --global windows-build-tools

https://github.com/JeremyEnglert/JointsWP/issues/317