I am installing Google App Engine under Windows (not using Cygwin).
After running the bat script, I closed and reopened the cmd.exe and entered inside the
just below path in environment variables there is PATHEXT, have to add .PY to it, as the gcloud is gcloud.py,
also have to add
C:\Program Files\Google\Cloud SDK\google-cloud-sdk\lib\googlecloudsdk\gcloud;
C:\Program Files\Google\Cloud SDK\google-cloud-sdk.staging\lib\googlecloudsdk\gcloud
to the environmental variable path.