Engine

class Engine:
    def __init__(self, path):
        self.path = path
        self.eng = Popen(path, universal_newlines=True, stdin=PIPE, stdout=PIPE)

    def __del__(self):
        self.eng.kill()

    def write(self, com):
        if not self.eng.stdin:
            raise BrokenPipeError
        self.eng.stdin.write(f'{com}\n')
        self.eng.stdin.flush()

    def readline(self):
        if not self.eng.stdout:
            raise BrokenPipeError
        return self.eng.stdout.readline().strip()

    def isready(self):
        self.write('isready')
        while True:
            if self.readline() == 'readyok':
                return

    def readfor(self, func):
        res = list()
        while True:
            text = self.readline()
            res.append(text)
            if func(text):
                return res