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#!/usr/bin/env python3
 
import sys
from decimal import Decimal
from random import randint
 
# メッセージ
message = {'opening' : 'Guess the number!',
           'prompt' : 'Please input your guess.',
           'failure' : 'Failed to read line',
           'guess' : 'You guessed: ',
           True : 'Too small!',
           False : 'Too big!',
           'win' : 'You win!'}
 
# 環境
class World(object):
    __match_args__ = ('guess', 'secret_number', 'ordering')
    def __init__(self, guess, secret_number, ordering):
        self.guess = guess
        self.secret_number = secret_number
        self.ordering = ordering
    def __repr__(self):
        return f'guess: {self.guess}, secret number: {self.secret_number}, ordering: {self.ordering}'
 
# 初期化
def init(mx):
    print(message['opening'])
    return World(Decimal('Infinity'), randint(1, mx), None)
 
# Read
def read(prompt):
    return int(input(prompt))
 
# Eval
def world_go(x, env):
    match env:
        case World(guess, secret_number, ordering):
            if x == secret_number:
                raise Exception(message['win'])
            else:
                return World(x, secret_number, x < secret_number)
 
# Print
def display(env):
    print(message['guess'] + str(env.guess))
    print(message[env.ordering])
    return env
 
# REPL
if __name__ == '__main__':
    w = init(100)
    while True:
        try:
            w = display(world_go(read(message['prompt']), w))
        except ValueError:
            print(message['failure'])
            w
        except Exception:
            print(message['win'])
            sys.exit()
 
 

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