退出 GUI 时出现 NoneType 错误答案

【问题标题】：I am having a NoneType error on exiting GUI退出 GUI 时出现 NoneType 错误
【发布时间】：2021-01-25 15:45:16
【问题描述】：

在以下代码中，退出 GUI 时出现 NoneType 错误。否则界面似乎工作正常，但退出时它告诉我“-Tables-”在第 77 行不可下标，即 'if values['-Tables-'] == True:'

我的猜测是，在我破坏代码后，我以某种方式再次执行了 while 循环，还是什么？（我在中间取出了更多 if 语句，但在添加这些单选按钮功能之前没有错误。）

import os 
import shutil
import sys
import math
import openpyxl
from datetime import datetime
from docx import Document
from docx.shared import Inches
from docx.oxml.table import CT_Tbl
from docx.oxml.text.paragraph import CT_P
from docx.table import Table
import PySimpleGUI as sg
import traceback

# Define the window's contents

tab1_layout =  [
          [sg.Text('Copy/Paste the row of the SC, CA, or CC from Teams')],
          [sg.Text('Customer name should have - rather than spaces')],
          [sg.Input(key='-INPUT-')],
          [sg.Text(size=(40,5), key='-OUTPUT-')],
          [sg.Checkbox('Delete Revision History', default=True, key='-Rev-'), sg.Checkbox('My second Checkbox!')],
         
          
          ]   

tab2_layout = [[sg.T('Use this page to:')],   
               [sg.T('    -Create a CC from a CA')], 
               [sg.T('    -Remove header info from a SOW to give to another SOW')], 
               [sg.T('    -Copy tables from one SOW to another')], 
               [sg.Radio('CA to CC', "RADIO", default=True, key='-CAtoCC-', enable_events=True), sg.Radio('Remove Customer Info', "RADIO", key='-RemoveCust-', enable_events=True), sg.Radio('Copy Tables', "RADIO", key='-Tables-', enable_events=True)],
               [sg.In(key='in1')],
               [sg.In(key='in2')],
               [sg.Checkbox('Header',disabled = True, key='-Head-'),sg.Checkbox('Hardware',disabled = True, key='-Hard-'),sg.Checkbox('Software', disabled = True, key='-Soft-'),sg.Checkbox('Calibration', disabled = True, key='-Cal-'),sg.Checkbox('Deliverables', disabled = True, key='-Deli-')],

               
               ]    

layout = [[sg.TabGroup([[sg.Tab('Tab 1', tab1_layout, key='Tab 1'), sg.Tab('Tab 2', tab2_layout, key='Tab 2')]], key='tab')],   
          [sg.Button('Create'), sg.Button('Clear'), sg.Button('Quit')]
          ]   

tableNames = ['Header', 'Hardware', 'Software', 'Calibration', 'Deliverables']
tableKeys = ['-Head-', '-Hard-', '-Soft-', '-Cal-', '-Deli-']

# Create the window
window = sg.Window('SOW and CA Creator', layout)
 
try:
   
    # Display and interact with the Window using an Event Loop
    while True:
        event, values = window.read()      
        
        
        if values['-Tables-'] == True:
            for i in tableKeys  :
               window[i].Update(disabled = False)
               continue

        if values['-Tables-'] == False:
            for i in tableKeys  :
                window[i].Update(disabled = True)
                continue

        if event == 'Create' and values['-in1-'] != '' and values['-in2-'] != '' and values['tab'] == 'Tab 2' and values['CAtoCC']:
            pass


       # See if user wants to quit or window was closed
        if event in (sg.WINDOW_CLOSED, 'Quit' ):
            window.close()
            break
        


except Exception as e:
    window.close()
    tb = traceback.format_exc()
    sg.Print(f'An error happened.  Here is the info:', e, tb)
    sg.popup_error(f'AN EXCEPTION OCCURRED!', e, tb)

【问题讨论】：

只需添加if '-Tables-' in values的支票？
这成功了！谢谢！ ...我真的不明白为什么需要它的流程？

标签： python python-3.x pysimplegui

【解决方案1】：

此问题的根本原因

event, values = window.read()

当点击窗口关闭按钮时，您可能会得到None, None for event, values。

那么如果你使用values[key] 的值是None，那么你会得到

TypeError: 'NoneType' object is not subscriptable

所以总是把语句放在前面的语句之后立即检查sg.WINDOW_CLOSED，就像

while True:
    event, values = window.read()
    if event == sg.WINDOW_CLOSED:
        break

    ...

    print(event, values)

window.close()

【讨论】：