How are generators and coroutines implemented in CPython?

Question

I\'ve read that in CPython, the interpreter stack (the list of Python functions called to reach this point) is mixed with the C stack (the list of C functions that were call

Answer 1

The yield instruction takes the current executing context as a closure, and transforms it into an own living object. This object has a __iter__ method which will continue after this yield statement.

So the call stack gets transformed into a heap object.