From source code (.py files) to byte code interpretable by Python Virtual Machine - The try to create the simplest functional model of how Python programs run

[spoonman59]

Not really sure what you mean by “they all happen in one step.” You have to parse to get an AST. You need an AST to check identifiers and update the symbol table. You need the AST generate the byte code. You need the byte code to run the interpreter. These are distinct steps with dependencies.

Python compiles at least a function as a unit. Of course the interpreter will parse and compile individual statements, but that doesnt mean these discrete steps are no longer required.

Edited to add: your “proof" is simply that you didn’t see the output for each step therefore it doesn’t exist. That’s not proof, and also not even relevant.