I disagree about Python. First, you can code a "manhole" in your code which lets you evaluate arbitrary string as Python code at runtime, basically a shell avai

I disagree about Python. First, you can code a "manhole" in your code which lets you evaluate arbitrary string as Python code at runtime, basically a shell available via a socket. Second, you don't even need that. Gdb with some tooling (see pyrasite) lets you attach to an arbitrary Python process and evaluate Python code in its context.