Function repl

02-array-seq/lispy/py3.10/lis.py:123–130

A prompt-read-eval-print loop.

(prompt: str = 'lis.py> ')

# tag::REPL[]
def repl(prompt: str = 'lis.py> ') -> NoReturn:
    "A prompt-read-eval-print loop."
    global_env = Environment({}, standard_env())
    while True:
        ast = parse(input(prompt))
        val = evaluate(ast, global_env)
        if val is not None:
            print(lispstr(val))

def lispstr(exp: object) -> str:
    "Convert a Python object back into a Lisp-readable string."