将动态填充的组合框中的选定值作为全局变量返回？

Question

我正在尝试自动化一些工作来处理从SQL引入的数据。在我的完整代码开始的时候，我从网站的其他地方找到并修改了下面的类，使之成为一个平滑的界面，这样其他人也可以使用代码

这样做的目的是从选项中检索所需的“MPAN”和一年。组合框完全按照我所希望的方式填充，但是当尝试将所选值作为全局变量检索时出现问题，并在单击“提交”时关闭GUI，因为没有发生任何事情，也没有获得值，但没有产生任何错误

我的假设是我在使用getMPAN函数时犯了一个错误，尽管我对这个级别的tkinter不是很有经验，所以我非常欣赏一只手。为了简单起见，我添加了category字典作为模拟数据

b2=[[2018],[2019],[2020],[2021],[2022],[2023],[2024],[2025]]
category = {'home': ['utilities','rent','cable'],
    'car': ['gas','oil','repairs'],
    'rv':['parks','maintenance','payment']}
params=''
mpan=''
year=''

class Application(Frame):

    def __init__(self, master=None, Frame=None):
        Frame.__init__(self, master)
        super(Application,self).__init__()
        self.grid(column = 5,row = 20,padx = 50,pady = 50)
        self.createWidgets()

    def getUpdateData(self,  event):
        self.AccountCombo['values'] = category[self.CategoryCombo.get()]
        self.AccountCombo.current(0)

    def createWidgets(self):
        tk.Label(text = 'Area Code:').grid(row = 2,column = 1,padx = 10)
        tk.Label(text = 'MPAN:').grid(row = 4,column = 1,padx = 10)
        tk.Label(text = 'Year:').grid(row = 6, column = 1, padx = 10)
        self.AccountCombo = ttk.Combobox( width = 15)
        self.AccountCombo.grid(row = 5,column = 1,pady = 25,padx = 10)

        self.CategoryCombo = ttk.Combobox(width = 15,  values = list(category.keys()))
        self.CategoryCombo.bind('<<ComboboxSelected>>', self.getUpdateData)
        self.CategoryCombo.grid(row = 3,column = 1,padx = 10,pady = 25)

        self.YearCombo = ttk.Combobox(width = 15, values = b2)
        self.YearCombo.grid(row = 7, column = 1, padx = 10, pady = 25)
        self.YearCombo.current(0)

    def getMPAN(self):
        mpan=self.AccountCombo.get()
        year=self.YearCombo.get()
        self.destroy()

        global params
        params=[mpan,year]

w=tk.Button(Application(), text='Submit', command=Application().getMPAN)
w.grid(row=8, column=1)

app = Application()
app.master.title('MPAN Selector')
app.mainloop()

这是我第一次在网站上发布，所以我很抱歉，如果我错过了任何细节。我见过类似的问题，但没有一个能解决这种情况

Answer 1

找出我错的地方

需要将按钮放入createWidgets函数中，以便从组合框中正确获取选定的值

至于用buttons命令关闭小部件，我只需要在init中添加以下行：

self.master=master

然后在getMPAN函数中，将destroy更改为：

self.master.destroy()

我相信这是相对马虎的修复，但总的来说这是我的代码：

b2=[[2018],[2019],[2020],[2021],[2022],[2023],[2024],[2025]]
category = {'home': ['utilities','rent','cable'],
    'car': ['gas','oil','repairs'],
    'rv':['parks','maintenance','payment']}
params=''
mpan=''
year=''

class Application(tk.Frame):

    def __init__(self, master=None, Frame=None):
        Frame.__init__(self, master)
        self.master=master
        super(Application,self).__init__()
        self.grid(column = 5,row = 20,padx = 50,pady = 50)
        self.createWidgets()

    def getUpdateData(self,  event):
        self.AccountCombo['values'] = category[self.CategoryCombo.get()]
        self.AccountCombo.current(0)

    def createWidgets(self):
        tk.Label(text = 'Area Code:').grid(row = 2,column = 1,padx = 10)
        tk.Label(text = 'MPAN:').grid(row = 4,column = 1,padx = 10)
        tk.Label(text = 'Year:').grid(row = 6, column = 1, padx = 10)
        self.AccountCombo = ttk.Combobox( width = 15)
        self.AccountCombo.grid(row = 5,column = 1,pady = 25,padx = 10)

        self.CategoryCombo = ttk.Combobox(width = 15,  values = list(category.keys()))
        self.CategoryCombo.bind('<<ComboboxSelected>>', self.getUpdateData)
        self.CategoryCombo.grid(row = 3,column = 1,padx = 10,pady = 25)

        self.YearCombo = ttk.Combobox(width = 15, values = b2)
        self.YearCombo.grid(row = 7, column = 1, padx = 10, pady = 25)
        self.YearCombo.current(0)

        button=ttk.Button(self, text='Submit', command=self.getMPAN)
        button.grid(row=9, column=1)

    def getMPAN(self):
        mpan=self.AccountCombo.get()
        year=self.YearCombo.get()
        self.master.destroy()

        global params
        params=[mpan,year]

w=tk.Button(Application(), text='Submit', command=Application().getMPAN)
w.grid(row=8, column=1)

app = Application()
app.master.title('MPAN Selector')
app.mainloop()