In the CPython reference interpreter, that VM can be found at https://github.com/python/cpython/blob/main/Python/ceval.c https://github.com/python/cpython/blob

In the CPython reference interpreter, that VM can be found at https://github.com/python/cpython/blob/main/Python/ceval.c https://github.com/python/cpython/blob/main/Python/ceval.c It's 3619 lines. It's explained in this 515 line file: https://github.com/python/cpython/blob/main/InternalDocs/ https://github.com/python/cpython/blob/main/InternalDocs/ For comparison, there is a pure Python bytecode interpreter, its VM is here: https://github.com/nedbat/byterun/blob/master/byterun/pyvm2.py https://github.com/nedbat/byterun/blob/master/byterun/pyvm2.... It's 1043 lines.