A PYTHON INTERPRETER

 written in Python

This interpreter is only focused on the last step in the execution of a Python program. Its input is instruction sets called bytecode.

Bytecode is an intermediate representation of Python code.

NB: The bytecode is produced by Python 3.5 or earlier

Python               Bytecode                 Ouput
source  ------>->                ------>->

Dummy Example

from engine import Interpreter

instruction_set = {
    "instructions": [
        ("LOAD_VALUE",  0),
        ("LOAD_VALUE", 1),
        ("ADD_TWO_VALUES", None),
        ("LOAD_VALUE", 2),
        ("ADD_TWO_VALUES", None),
        ("PRINT_ANSWER", None)
    ],
    "numbers" : [6, 7, 8]
}

interpreter = Interpreter()
interpreter.execute(instruction_set)

# It outputs `21`

Real Example

1

from vm import VirtualMachine

code = compile("""
a = 6
b = 7
print(a + b)
""",
filename="error.log", mode="exec")

VirtualMachine().execute(code)

2

code = compile("""
def loop(y, x=5):
    total = 0
    for i in range(x):
        total = total + i
    print(total)
""",
filename="error.log", mode="exec")

VirtualMachine().execute(code)

For more information, read interpreter.txt

Source