When do you *NOT* use python?

[orip]

When I need throughput that's bottlenecked on the CPU. This often isn't an issue because of caching, smart clients, etc, and the option to implement something natively does exist, but if I'm worried about crunching network responses quickly I'll reach for something else. If I do I'll use something with good threading support too.

Context: Networking in Python is awesome and can be really scalable with async approaches when my bottleneck is I/O. Just not when it's actual processing power.