https://opensource.com/article/18/4/introduction-python-bytecode

Saint Olaf College

The virtual machine used in CPython is stack-based, meaning that its operation relies on stack data structures. CPython uses three types of stacks:
- The call stack, which holds an entry, known as a frame, for every function call in the program. When a function call returns, it is popped off the call stack.
- An evaluation stack for each frame in the call stack, where function execution occurs. Executing code involves pushing objects to this stack, manipulating them, and popping them.
- The block stack, used to keep track of certain control structures like loops or try/except blocks.

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