feature request: show errors in red

Considering all the output pius users have to see and how the process can mentally put someone into an autopilot state, errors can easily go unnoticed. There's also a natural tendency to focus on the next prompt. And also since there is no other mechanism ATM for recording failures it's somewhat important that errors be seen. I suggest highlighting errors in red, or making them blink, or something. It should be done in a way that doesn't produce junk on non-color terminals (e.g. when the output is streamed to a text file). In zsh there's a simple test to check if the terminal is color.. not sure about python.