我在退出 GUI 时遇到 NoneType 错误

Question

在下面的代码中，我在退出 GUI 时收到 NoneType 错误。该界面在其他方面似乎工作正常，但退出时它告诉我“-Tables-”在第 77 行不可订阅，即 'if values['-Tables-'] == True:'

我的猜测是我在破坏代码后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的 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)

Answer 1

此问题的根本原因

event, values = window.read()

当 window 单击关闭按钮时，您可能会 None, None for event, values。

然后如果你使用 values[key] 值是 None，那么你将得到

TypeError: 'NoneType' object is not subscriptable

所以总是在前面的语句之后立即检查sg.WINDOW_CLOSED语句，比如

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

    ...

    print(event, values)

window.close()

我在退出 GUI 时遇到 NoneType 错误

I am having a NoneType error on exiting GUI

python

python-3.x

pysimplegui