xingque isn't actively updated, but it has fantastic capability to call back into Python code from the Starlark code

starlark_in_python.py

from xingque import AstModule, GlobalsBuilder, Evaluator


def foo():
    return 88


def main():
    text = """
def square(x):
    return x * x

a = 42
b = square(a)

z = b + 1 + int(bool(233))
foo()
"""
    ast = AstModule.parse("test.star", text)
    gb = GlobalsBuilder.standard()
    gb.set("foo", foo)
    g = gb.build()
    e = Evaluator()
    result = e.eval_module(ast, g)
    print(type(result))
    print(result)


if __name__ == '__main__':
    main()