在 PySimpleGUI 中：如何根据用户在另一个 Drop 对象中的选择来设置 Drop 对象的值？

如何解决在 PySimpleGUI 中：如何根据用户在另一个 Drop 对象中的选择来设置 Drop 对象的值？

例如，我有两个 Drop 对象下拉列表。第一个用户可以从 OPTIONS_CHOICE 中选择，第二个是基于用户在 OPTION_CHOICE 中的选择。 IE。如果用户在第一个下拉列表中选择“Geometric Asian”，则只有 ['Closed Form','Monte Carlo'] 可供选择。

import sys
import PySimpleGUI as sg

OPTIONS_CHOICE = ['European','American','Geometric Asian','Arithmetic Asian','Geometric Basket','Arithmetic Basket']

methodology = {
    'European' : ['Black Scholes','Binominal Tree'],'American' : ['Binominal Tree'],'Geometric Asian' : ['Closed Form','Monte Carlo'],'Arithmetic Asian' : ['Monte Carlo','Monte Carlo with Control Variate'],'Geometric Basket' : ['Closed Form','Arithmetic Basket' : ['Monte Carlo',}

option_layout = [
    [sg.Text('Step 1: Select an Option Type',background_color='darkseagreen')],[sg.Text('Option Type:',background_color='darkseagreen'),sg.Drop(values=OPTIONS_CHOICE,default_value = 'European',auto_size_text=True,enable_events=True,key='option_type')],[sg.Text('Step 2: Select a Methodology',[sg.Text('Methodology:',sg.Drop(values=option_choice,auto_size_text=True)]
    ]

iv_layout = [[sg.Text('This is inside tab 5')],[sg.Input(key='-in4-')]]


layout = [[sg.TabGroup([[sg.Tab('Option Value',option_layout,background_color='darkseagreen',key='-mykey-'),sg.Tab('Implied Volatility',iv_layout)]],key='-group1-',tab_location='top',selected_title_color='purple')],[sg.Button('Compute')]]

window = sg.Window('Option Calculator',layout,default_element_size=(12,1))

while True:
    event,values = window.read()
    sg.popup_non_blocking(event,values)
    print(event,values)
    if event == sg.WIN_CLOSED:           # always,always give a way out!
        break

    print(event,values)


window.close()

解决方法

在事件循环中的第一个 Drop 事件时更新第二个 Drop 元素。

import sys
import PySimpleGUI as sg

OPTIONS_CHOICE = ['European','American','Geometric Asian','Arithmetic Asian','Geometric Basket','Arithmetic Basket']

methodology = {
    'European' : ['Black Scholes','Binominal Tree'],'American' : ['Binominal Tree'],'Geometric Asian' : ['Closed Form','Monte Carlo'],'Arithmetic Asian' : ['Monte Carlo','Monte Carlo with Control Variate'],'Geometric Basket' : ['Closed Form','Arithmetic Basket' : ['Monte Carlo',}

default1 = OPTIONS_CHOICE[0]
option_choice = methodology[default1]
default2 = option_choice[0]

option_layout = [
    [sg.Text('Step 1: Select an Option Type',background_color='darkseagreen')],[sg.Text('Option Type:',background_color='darkseagreen'),sg.Drop(values=OPTIONS_CHOICE,default_value = default1,auto_size_text=True,enable_events=True,key='option_type')],[sg.Text('Step 2: Select a Methodology',[sg.Text('Methodology:',sg.Drop(values=option_choice,default_value = default2,key='option_value')]
    ]

iv_layout = [[sg.Text('This is inside tab 5')],[sg.Input(key='-in4-')]]


layout = [[sg.TabGroup([[sg.Tab('Option Value',option_layout,background_color='darkseagreen',key='-mykey-'),sg.Tab('Implied Volatility',iv_layout)]],key='-group1-',tab_location='top',selected_title_color='purple')],[sg.Button('Compute')]]

window = sg.Window('Option Calculator',layout,default_element_size=(12,1))

while True:

    event,values = window.read()

    print(event,values)
    if event == sg.WIN_CLOSED:           # always,always give a way out!
        break
    elif event == 'option_type':
        select = values[event]
        option_choice = methodology[select]
        window['option_value'].update(value=option_choice[0],values=option_choice)
    sg.popup_non_blocking(event,values)

window.close()