numpy allows you to do some pretty low level stuff (like creating buffer from a raw pointer), which GAE wants to avoid for obvious security issues. Same rationa

numpy allows you to do some pretty low level stuff (like creating buffer from a raw pointer), which GAE wants to avoid for obvious security issues. Same rationale as why ctypes (parts of the stdlib) is not available. I have never used numpy on GAE, but I would suspect some of it is not enabled for those reasons.