def increment(self, amount=1, *args, **kwargs):
        self._current = self._current + amount
when pty=True, we use pty.fork and os.exec*
dataset/ETHPy150Open PacketPerception/pychievements/pychievements/achievements.py/Achievement.increment--crossover with--dataset/ETHPy150Open pyinvoke/invoke/tests/runners.py/Local_.pty_and_pty_fallback.when_pty_True_we_use_pty_fork_and_os_exec