Manually assembling a code object

make_addone.py

"""
$ python example.py
1 + 1 is 2
"""

from types import FunctionType

from codetransformer import Code
import codetransformer.instructions as instrs


def make_func():
    """Make a function equivalent to::

        def addone(x):
            return x + 1
    """
    instructions = [
        instrs.LOAD_FAST('x'),
        instrs.LOAD_CONST(1),
        instrs.BINARY_ADD(),
        instrs.RETURN_VALUE(),
    ]
    code = Code(instructions, argnames=('x',), name='addone')
    return FunctionType(code.to_pycode(), globals={})


addone = make_func()

print("1 + 1 is", addone(1))