如何重新打开pysimplegui窗口？

import PySimpleGUI as sg

def main_window():
    layout = [[sg.Text("Hello, World!")],
              [sg.Button("Open New Window", key="-OPEN-")]]
    window = sg.Window("Main Window", layout)

    while True:
        event, values = window.read()
        if event == sg.WINDOW_CLOSED:
            break
        elif event == "-OPEN-":
            window.close()  # 关闭当前窗口
            new_window()    # 打开新窗口

    window.close()

def new_window():
    layout = [[sg.Text("New Window")],
              [sg.Button("Back", key="-BACK-")]]
    window = sg.Window("New Window", layout)

    while True:
        event, values = window.read()
        if event == sg.WINDOW_CLOSED or event == "-BACK-":
            window.close()  # 关闭当前窗口
            main_window()   # 返回主窗口
            break

    window.close()

if __name__ == "__main__":
    main_window()