SimPy和PyQt交互

Question

我一直在寻找让PyQt和SimPy互相“对话”的机会。例如，在下面的代码中，我有一个带有单个标签的PyQt小部件，它显示SimPy环境时间。我希望这个标签随着模拟的进行而更新(我曾尝试用simpy_generator函数显示--小部件中的标签被更新，SimPy在一段时间内超时，并且此模式重复)。

import sys
import simpy
from PyQt5 import QtWidgets

class Window(QtWidgets.QWidget):
    """ A generic Qt window that can interact with SimPy.
    """

    def __init__(self, env, parent=None):
        """ Class constructor.

        Args:
            env: SimPy environment.
            parent: Optional parent of this widget.
        """
        super(Window, self).__init__()
        self.env = env
        self.init()

    def init(self) -> None:
        """ Initialise the layout of the widget. Just a label that displays the
        SimPy Environment time.
        """
        layout = QtWidgets.QVBoxLayout()
        self.label = QtWidgets.QLabel('SimPy Time: {}'.format(self.env.now))
        layout.addWidget(self.label)
        self.setLayout(layout)
        self.show()

    def update(self) -> None:
        """ Update method for the window; retrieve the current SimPy environment time
        and update the label.
        """
        self.label.setText("SimPy Time: {}".format(self.env.now))

def simpy_generator(env, window):
    """ Generator for SimPy simulation; just tick the environment's clock and update
    the QtWidget's fields.

    Args:
        env: SimPy environment.
        window: QtWidget to update with SimPy data.
    """
    while True:
        window.update()
        yield env.timeout(1)

if __name__ == "__main__":

    env = simpy.Environment()
    app = QtWidgets.QApplication(sys.argv)
    window = Window(env=env)

    ### These need to be incorporated into the Qt event queue somehow?
    # simpy_process = env.process(simpy_generator(env, window))
    # env.run(until=25)

    app.exec_()

然而，对于如何才能使其工作，我确实感到困惑不已。我知道Qt需要管理它的事件队列，而更新通常是通过一些QTimer来完成的，这些as发出一个信号来触发它所链接的某个插槽的运行(在本例中是Window的update方法)。但这似乎与SimPy自己的事件队列不兼容(或者更确切地说，我太不了解它们应该如何交互)；生成器需要作为一个进程添加到环境中，然后环境设置为运行直到完成(参见代码的注释部分)。

有人能建议我如何才能做到这一点吗？

Answer 1

根据Michael的回答，SimPy模拟是在独立线程上启动的。上面的代码被修改为包含以下内容：

def simpy_thread(env, window):
    """ Function to be run on a dedicated thread where the SimPy simulation will live.

    Args:
        env: SimPy environment.
        window: QtWidget to update with SimPy data.
    """
    simpy_process = env.process(simpy_generator(env, window))
    env.run(until=25)

if __name__ == "__main__":

    env = simpy.rt.RealtimeEnvironment(factor=1)

    # Create the Qt window
    app = QtWidgets.QApplication(sys.argv)
    window = Window(env=env)

    # Launch a dedicated SimPy thread that has a reference to the window for updating
    thread = threading.Thread(target=simpy_thread, args=(env,window,))
    thread.start()

    # Finally, start the Qt event queue; the code will block at this point until the window
    # object is destroyed
    app.exec_()

仍然非常有兴趣知道人们是否有其他解决方案:)