Tkinter Optionmenu StringVar.get（）返回空白

Question

我正在创建一个带有“ for循环”的Tkinter窗口，以便以后可以自行调整时，我决定添加更多问题。我的问题是我无法在选项菜单上保存输入的值。到目前为止，我所得到的只是一个list1 = ['', '', '']而一个Strg_var = [StringVar, StringVar, StringVar]，它只显示空格和变量PY_numbers。

import tkinter as tk
from tkinter import *

LARGE_FONT = ("Arial", 12)

window=Tk()

def _save():
    print(*list1, sep = ", ")
    print(*Strg_var, sep = ", ")

Questionlist = ["A. Is A true? :", "B. Is B true? :", "C. Is C true? :"]          
choices = ['-', 'Yes', 'No'] 
n = 0
Strg_var=[0]*len(Questionlist)
list1=[]
for n in range(len(Questionlist)): 
    Label(window, text=Questionlist[n], font = LARGE_FONT, background = "white").grid(row= n, column=0, columnspan=2, padx=10, pady = 10, sticky="W")
    a = tk.StringVar(window)
    OptionMenu(window, a, choices[0], *choices).grid(row = n, column=2, padx=10, sticky="WE")
    list1.append(a.get())

tk.Button(window, text="Save", command = _save,width=18).grid(row=16, column=0, padx=10, pady=15, sticky="W")

window.mainloop()

有人可以帮助我解决如何将选项菜单用户选择保存到列表中吗？

Answer 1

您可以列出StringVar（初始化它们，我的代码中还没有完成）。每次选择一个选项，相应的项目都会更改。所以我会这样。

import tkinter as tk

LARGE_FONT = ("Arial", 12)

window=tk.Tk()

def _save():
    print(list(map(lambda x: x.get(), a)))

Questionlist = ["A. Is A true? :", "B. Is B true? :", "C. Is C true? :"]          
choices = ['-', 'Yes', 'No']
a = [tk.StringVar(window) for i in range(len(Questionlist))]
n = 0
for n in range(len(Questionlist)): 
    tk.Label(window, text=Questionlist[n], font = LARGE_FONT, background = "white").grid(row= n, column=0, columnspan=2, padx=10, pady = 10, sticky="W")
    Strg_var = tk.StringVar(window)
    tk.OptionMenu(window, a[n], *choices).grid(row = n, column=2, padx=10, sticky="WE")

tk.Button(window, text="Save", command = _save,width=18).grid(row=16, column=0, padx=10, pady=15, sticky="W")

window.mainloop()

输出：

['No', '-', 'Yes']