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#!/usr/bin/env python3
 
import sys
from random import randint
 
# メッセージ分離方式
msg = {'cont': 'continue?[y/n] ',
       'prompt': 'Type a guess: ',
       'l': 'lower',
       'u': 'upper',
       None: ''}
 
# 環境
class Env(object):
    __match_args__ = ('secret_num', 'boolean', 'count', 'key')
    def __init__(self, secret_num, boolean = False, count = 0, key = None):
        self.secret_num = secret_num
        self.boolean = boolean
        self.count = count
        self.key = key
    # デバッグ用
    def __repr__(self):
        return f'<secret_num: {self.secret_num} boolean: {self.boolean} count: {self.count} key: {self.key}>'
 
# 環境の初期化
def init():
    return Env(randint(1, 100))
 
# Read(読み込み部)
def read(env):
    proc = {True: lambda x: x.lower() == 'y', False: int}
    key = {True: 'cont', False: 'prompt'}
    return proc[env.boolean](input(msg[key[env.boolean]]))
 
# Evaluator(評価器)
def interp(x, env):
    match env:
        case Env(secret_num, boolean, count, key):
            if boolean:
                if x:
                    return init()
                else:
                    sys.exit()
            else:
                return Env(secret_num,
                           x == secret_num,
                           count + 1,
                           'l' if x > secret_num else 'u')
 
# Print(出力部)
def display(env):
    match env:
        case Env(secret_num, boolean, count, key):
            print(count if boolean else msg[key])
    return env
 
# 端末で起動する    
if __name__ == '__main__':
    # 環境の初期化
    env = init()
    # Read-Eval-Print Loop(REPL)
    while True:
        env = display(interp(read(env), env))
 

Traceback (most recent call last):
  File "/usr/lib/python3.9/py_compile.py", line 144, in compile
    code = loader.source_to_code(source_bytes, dfile or file,
  File "<frozen importlib._bootstrap_external>", line 918, in source_to_code
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "./prog.py", line 37
    match env:
          ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.9/py_compile.py", line 150, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 37
    match env:
          ^
SyntaxError: invalid syntax

Standard output is empty