title: How to fix: gyp ERR! stack Error: Can't find Python executable "python"'
body: <p>I've removed node modules and reinstall it but not solving the problem. If I run <code>yarn add node-sass</code>, the following error comes up in my terminal</p>
  
  <pre><code>gyp verb `which` failed     at C:\Users\IT\Desktop\react-course-projects\indecision-app\node_modules\which\which.js:89:16
  gyp verb `which` failed     at C:\Users\IT\Desktop\react-course-projects\indecision-app\node_modules\isexe\index.js:42:5
  gyp verb `which` failed     at C:\Users\IT\Desktop\react-course-projects\indecision-app\node_modules\isexe\windows.js:36:5
  gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:153:21)
  gyp verb `which` failed   stack:
  gyp verb `which` failed    'Error: not found: python\n    at getNotFoundError (C:\\Users\\IT\\Desktop\\react-course-projects\\indecision-app\\node_modules\\which\\which.js:13:12)\n    at F (C:\\Users\\IT\\Desktop\\react-course-projects\\indecision-app\\node_modules\\which\\which.js:68:19)\n    at E (C:\\Users\\IT\\Desktop\\react-course-projects\\indecision-app\\node_modules\\which\\which.js:80:29)\n    at C:\\Users\\IT\\Desktop\\react-course-projects\\indecision-app\\node_modules\\which\\which.js:89:16\n    at C:\\Users\\IT\\Desktop\\react-course-projects\\indecision-app\\node_modules\\isexe\\index.js:42:5\n    at C:\\Users\\IT\\Desktop\\react-course-projects\\indecision-app\\node_modules\\isexe\\windows.js:36:5\n    at FSReqWrap.oncomplete (fs.js:153:21)',
  gyp verb `which` failed   code: 'ENOENT' }
  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:\Users\IT\Desktop\react-course-projects\indecision-app\node_modules\node-gyp\lib\configure.js:484:19)
  gyp ERR! stack     at PythonFinder.&lt;anonymous&gt; (C:\Users\IT\Desktop\react-course-projects\indecision-app\node_modules\node-gyp\lib\configure.js:509:16)
  gyp ERR! stack     at callback (C:\Users\IT\Desktop\react-course-projects\indecision-app\node_modules\graceful-fs\polyfills.js:295:20)
  gyp ERR! stack     at FSReqWrap.oncomplete (fs.js:153:21)
  gyp ERR! System Windows_NT 10.0.17763
  gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\IT\\Desktop\\react-course-projects\\indecision-app\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
  gyp ERR! cwd C:\Users\IT\Desktop\react-course-projects\indecision-app\node_modules\node-sass
  gyp ERR! node -v v10.16.0
  gyp ERR! node-gyp -v v3.8.0
  gyp ERR! not ok
  Build failed with error code: 1
  info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
  </code></pre>
  
  <p>node and npm version are</p>
  
  <pre><code>node- v 10.16.0
  npm -v 6.9.0
  </code></pre>