I downloaded the Google App Engine as a zip format, unzipped it to /usr/local/google_engine
Now I need to run a python script from that folder all the time. How do I
There are two ways to do this. As Kal mentioned above you can add the folder to the path variable by adding
export PATH=/usr/local/google_app_engine/bin:$PATH1
to your .bashrc. Alternatively, if the command is just one script you can move or copy it to /usr/bin. This will make it accessible as a command from anywhere.
If you want to create a command to do this without moving script.py then you can create a bash file that calls it with a fixed path then put that in /usr/bin