Python Bytecode

https://realpython.com/ref/glossary/bytecode/

It’s kind of like assembly language, but it’s assembly for the Python virtual machine.

>>> import dis
 
>>> def greet(name):
...     return f"Hello, {name}!"
...
 
>>> dis.dis(greet)
  3           RESUME                   0
 
  4           LOAD_CONST               0 ('Hello, ')
              LOAD_FAST_BORROW         0 (name)
              FORMAT_SIMPLE
              LOAD_CONST               1 ('!')
              BUILD_STRING             3
              RETURN_VALUE

LOAD_FAST x      # load local variable x
LOAD_GLOBAL len  # load global name len
STORE_FAST y     # store into local variable y

C variable:
typed memory slot holding raw bits

Python variable:
name/slot holding a reference to a PyObject

Related

• Python Under the Hood