用Python（推荐导入PySimpleGUI库）写一个面积计算器，首先在主界面选择需要计算矩形、三角形、圆形哪种图形的面积，然后根据选择跳转其对应的界面输入需要的数据并给出结果，得到结果后可以选择返回主界面继续使用计算器并且系统不会崩溃

好的，以下是代码实现：

import PySimpleGUI as sg
import math

# 定义主界面
def main_menu():
    layout = [
        [sg.Text('请选择需要计算的图形')],
        [sg.Button('矩形', key='rectangle'), sg.Button('三角形', key='triangle'), sg.Button('圆形', key='circle')],
        [sg.Text('结果：'), sg.Output(size=(30, 1))],
        [sg.Button('退出', key='exit')]
    ]
    return sg.Window('面积计算器', layout=layout, finalize=True)

# 定义矩形计算界面
def rectangle_menu():
    layout = [
        [sg.Text('请输入矩形的长和宽')],
        [sg.Text('长：'), sg.InputText(key='length')],
        [sg.Text('宽：'), sg.InputText(key='width')],
        [sg.Button('计算', key='calculate'), sg.Button('返回', key='back')]
    ]
    return sg.Window('矩形面积计算', layout=layout, finalize=True)

# 定义三角形计算界面
def triangle_menu():
    layout = [
        [sg.Text('请输入三角形的底和高')],
        [sg.Text('底：'), sg.InputText(key='base')],
        [sg.Text('高：'), sg.InputText(key='height')],
        [sg.Button('计算', key='calculate'), sg.Button('返回', key='back')]
    ]
    return sg.Window('三角形面积计算', layout=layout, finalize=True)

# 定义圆形计算界面
def circle_menu():
    layout = [
        [sg.Text('请输入圆的半径')],
        [sg.Text('半径：'), sg.InputText(key='radius')],
        [sg.Button('计算', key='calculate'), sg.Button('返回', key='back')]
    ]
    return sg.Window('圆形面积计算', layout=layout, finalize=True)

# 运行主程序
def run():
    main_window = main_menu()
    rectangle_window, triangle_window, circle_window = None, None, None

    while True:
        window, event, values = sg.read_all_windows()

        if window == main_window:
            if event in (sg.WIN_CLOSED, 'exit'):
                break
            elif event == 'rectangle':
                rectangle_window = rectangle_menu()
                main_window.hide()
            elif event == 'triangle':
                triangle_window = triangle_menu()
                main_window.hide()
            elif event == 'circle':
                circle_window = circle_menu()
                main_window.hide()
        elif window == rectangle_window:
            if event in (sg.WIN_CLOSED, 'back'):
                rectangle_window.close()
                main_window.un_hide()
            elif event == 'calculate':
                try:
                    length = float(values['length'])
                    width = float(values['width'])
                    area = length * width
                    print(f'矩形面积为 {area:.2f}')
                except ValueError:
                    print('请输入正确的数字')
        elif window == triangle_window:
            if event in (sg.WIN_CLOSED, 'back'):
                triangle_window.close()
                main_window.un_hide()
            elif event == 'calculate':
                try:
                    base = float(values['base'])
                    height = float(values['height'])
                    area = base * height / 2
                    print(f'三角形面积为 {area:.2f}')
                except ValueError:
                    print('请输入正确的数字')
        elif window == circle_window:
            if event in (sg.WIN_CLOSED, 'back'):
                circle_window.close()
                main_window.un_hide()
            elif event == 'calculate':
                try:
                    radius = float(values['radius'])
                    area = math.pi * radius ** 2
                    print(f'圆形面积为 {area:.2f}')
                except ValueError:
                    print('请输入正确的数字')

    main_window.close()

if __name__ == '__main__':
    run()

运行代码后，会弹出一个主界面，选择需要计算的图形后进入对应的计算界面。计算完毕后可以选择返回主界面或退出程序。其中使用了PySimpleGUI库来构建界面。