Tkinter OptionMenu不能在函数中使用.get

Question

我正在编写一些代码，当optionMenu被更改时，我需要一个变量来更改，下面是我的一些代码

#!/user
# -*- coding: utf-8 -*-

import locale
import Tkinter as Tk

root = Tk.Tk()
root.title("My Tax Calculator")
root.geometry("700x225")

def getStudentLoan():
    global StudentLoan
    StudentLoan = StudentLoanLi.get()

LeftFrame = Tk.Frame(root, width=300, height=200, pady=3)

Placeholder2 = Tk.Label(LeftFrame, text="")
Placeholder2.grid(row=2, column=1)

StudentLoanOp = Tk.StringVar()
StudentLoanOp.set("No")

StudentLoanLi = Tk.OptionMenu(Placeholder2, StudentLoanOp, "No", "Plan 1", "Plan 2", command=lambda _: getStudentLoan())
StudentLoanLi.grid(row=2, column=1)

Tk.mainloop()

这在pycharm编辑器中是行不通的--我得到了这个错误--“类‘OptionMenu’的未解决属性引用错误”

当我执行代码并尝试更改OptionMenu时，就会在控制台中得到这个错误。

"StudentLoan = StudentLoanLi.get() AttributeError: OptionMenu实例没有属性'get'“

任何帮助都将不胜感激。

Answer 1

OptionMenu类没有get方法。从OptionMenu中获取选定项的正确方法是使用OptionMenu's StringVar的get方法，您将其命名为StudentLoanOp

def getStudentLoan():
    global StudentLoan
    StudentLoan = StudentLoanOp.get()