title: I get an error when I start ng new blabla
body: <p>I get the following error when I try to execute " ng new angular-realtime-polling":</p>
  
  <pre><code>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 (U:\angular-realtime-polling\node_modules\which\which.js:13:12)
  gyp verb `which` failed     at F (U:\angular-realtime-polling\node_modules\which\which.js:68:19)
  gyp verb `which` failed     at E (U:\angular-realtime-polling\node_modules\which\which.js:80:29)
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\which\which.js:89:16
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\isexe\index.js:42:5
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\isexe\windows.js:36:5
  gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:153:21)
  gyp verb `which` failed  python2 { Error: not found: python2
  gyp verb `which` failed     at getNotFoundError (U:\angular-realtime-polling\node_modules\which\which.js:13:12)
  gyp verb `which` failed     at F (U:\angular-realtime-polling\node_modules\which\which.js:68:19)
  gyp verb `which` failed     at E (U:\angular-realtime-polling\node_modules\which\which.js:80:29)
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\which\which.js:89:16
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\isexe\index.js:42:5
  gyp verb `which` failed     at U:\angular-realtime-polling\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: python2\n    at getNotFoundError (U:\\angular-realtime-polling\\node_modules\\which\\which.js:13:12)\n    at F (U:\\angular-realtime-polling\\node_modules\\which\\which.js:68:19)\n    at E (U:\\angular-realtime-polling\\node_modules\\which\\which.js:80:29)\n    at U:\\angular-realtime-polling\\node_modules\\which\\which.js:89:16\n    at U:\\angular-realtime-polling\\node_modules\\isexe\\index.js:42:5\n    at U:\\angular-realtime-polling\\node_modules\\isexe\\windows.js:36:5\n    at FSReqWrap.oncomplete (fs.js:153:21)',
  gyp verb `which` failed   code: 'ENOENT' }
  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 (U:\angular-realtime-polling\node_modules\which\which.js:13:12)
  gyp verb `which` failed     at F (U:\angular-realtime-polling\node_modules\which\which.js:68:19)
  gyp verb `which` failed     at E (U:\angular-realtime-polling\node_modules\which\which.js:80:29)
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\which\which.js:89:16
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\isexe\index.js:42:5
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\isexe\windows.js:36:5
  gyp verb `which` failed     at FSReqWrap.oncomplete (fs.js:153:21)
  gyp verb `which` failed  python { Error: not found: python
  gyp verb `which` failed     at getNotFoundError (U:\angular-realtime-polling\node_modules\which\which.js:13:12)
  gyp verb `which` failed     at F (U:\angular-realtime-polling\node_modules\which\which.js:68:19)
  gyp verb `which` failed     at E (U:\angular-realtime-polling\node_modules\which\which.js:80:29)
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\which\which.js:89:16
  gyp verb `which` failed     at U:\angular-realtime-polling\node_modules\isexe\index.js:42:5
  gyp verb `which` failed     at U:\angular-realtime-polling\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 (U:\\angular-realtime-polling\\node_modules\\which\\which.js:13:12)\n    at F (U:\\angular-realtime-polling\\node_modules\\which\\which.js:68:19)\n    at E (U:\\angular-realtime-polling\\node_modules\\which\\which.js:80:29)\n    at U:\\angular-realtime-polling\\node_modules\\which\\which.js:89:16\n    at U:\\angular-realtime-polling\\node_modules\\isexe\\index.js:42:5\n    at U:\\angular-realtime-polling\\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 (U:\angular-realtime-polling\node_modules\node-gyp\lib\configure.js:484:19)
  gyp ERR! stack     at PythonFinder.&lt;anonymous&gt; (U:\angular-realtime-polling\node_modules\node-gyp\lib\configure.js:509:16)
  gyp ERR! stack     at U:\angular-realtime-polling\node_modules\graceful-fs\polyfills.js:282:31
  gyp ERR! stack     at FSReqWrap.oncomplete (fs.js:153:21)
  gyp ERR! System Windows_NT 10.0.16299
  gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "U:\\angular-realtime-polling\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cflags=" "--libsass_ldflags=" "--libsass_library="
  gyp ERR! cwd U:\angular-realtime-polling\node_modules\node-sass
  gyp ERR! node -v v10.15.3
  gyp ERR! node-gyp -v v3.8.0
  gyp ERR! not ok
  Build failed with error code: 1
  npm WARN rollback Rolling back readable-stream@2.3.6 failed (this is probably harmless): EPERM: operation not permitted, lstat 'U:\angular-realtime-polling\node_modules\fsevents\node_modules'
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.7 (node_modules\fsevents):
  npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.7: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: node-sass@4.11.0 (node_modules\node-sass):
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: node-sass@4.11.0 postinstall: `node scripts/build.js`
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1
  </code></pre>
  
  <p>added 1013 packages from 1014 contributors and audited 42608 packages in 1412.486s
  found 0 vulnerabilities
  Der Befehl "git" ist entweder falsch geschrieben oder
  konnte nicht gefunden werden.</p>
  
  <p>Does someone know why I get this error and how I can fix it ? Because I have no clue. Thank you very much ! </p>