Available runtimes
You can write web applications on top of Google App Engine in many programming languages, and your choices include Python, Java, Go, and PHP. For Python, two versions of runtimes are available, we will focus on the latest version.
Let's briefly look at each of the environments.
Python
The most basic and important principle of all runtime environments, including that of Python, is that you can talk to the outside world only by going through Google's own services. It is like a completely sealed and contained sandbox where you are not allowed to write to the disk or to connect to the network. However, no program will be very useful in that kind of isolation. Therefore, you can definitely talk to the outside world but only through ...
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