单选按钮变量不更新

Question

我知道有人问过类似的问题，我已经尝试了所有建议的方法来解决这个问题，但我无法解决这个问题。我正在制作一个文档，当按下单选按钮时，会出现第二个单选按钮，其中的选项会根据对第一个单选按钮的响应而有所不同。问题是在选择第一个单选按钮后没有任何反应，变量未设置为等于该值，如果我理解正确的话应该是这个值。我什至摆脱了创建按钮并添加辅助功能的循环命令行试图设置变量但没有运气......我开始认为这不能使用单选按钮来完成......有谁知道我是否遗漏了一些不允许设置变量的东西？

from tkinter import Tk, Label, IntVar, Radiobutton

class pricingDoc:

    def __init__(self, master):
        self.master = master
        master.title("Dyna-Vac Equipment Pricing GUI")

        models = ["DJ5.636", "DJ1225", "DJ2040", "DJ4020", "DJ4030", "DJ6520"]
        model_prices = [8139.00, 23770.00, 48050.00, 48040.00, 48030.00, 66050.0]
        reels = ["""3/8" x 150'""", """1/2" x 300'""", """1/2" x 500'""", """3/4" x 600'""",
                 """3/4" x 800'""", """1" x 600'""", """1" x 800'"""]
        reel_prices = [0.00, 0.00, 850.00, 0.00, 1050.00, 0.00, 850.00]

        self.label1 = Label(master, text="Jet Trailer Model")
        self.label1.grid(row=1, column=1)
        self.label2 = Label(master, text="Price, in USD")
        self.label2.grid(row=1, column=3)

        def showchoice(var1, updateint):
            var1.set(updateint)

        var1 = IntVar(master)

        row_counter = 2
        self.modelbutton = Radiobutton(master, text=models[0], variable=var1, value=0, indicatoron=False,
                                           activebackground="green", width=12, command=lambda: showchoice(var1, 0))
        self.modelbutton.grid(row=row_counter, column=1)
        row_counter += 1
        self.modelbutton = Radiobutton(master, text=models[1], variable=var1, value=1, indicatoron=False,
                                         activebackground="green", width=12, command=lambda: showchoice(var1, 1))
        self.modelbutton.grid(row=row_counter, column=1)
        row_counter += 1
        self.modelbutton = Radiobutton(master, text=models[2], variable=var1, value=2, indicatoron=False,
                                         activebackground="green", width=12, command=lambda: showchoice(var1, 2))
        self.modelbutton.grid(row=row_counter, column=1)
        row_counter += 1
        self.modelbutton = Radiobutton(master, text=models[3], variable=var1, value=3, indicatoron=False,
                                         activebackground="green", width=12, command=lambda: showchoice(var1, 3))
        self.modelbutton.grid(row=row_counter, column=1)
        row_counter += 1
        self.modelbutton = Radiobutton(master, text=models[4], variable=var1, value=4, indicatoron=False,
                                         activebackground="green", width=12, command=lambda: showchoice(var1, 4))
        self.modelbutton.grid(row=row_counter, column=1)
        row_counter += 1
        self.modelbutton = Radiobutton(master, text=models[5], variable=var1, value=5, indicatoron=False,
                                         activebackground="green", width=12, command=lambda: showchoice(var1, 5))
        self.modelbutton.grid(row=row_counter, column=1)

        row_counter = 2

        for price in model_prices:
            self.label3 = Label(master, text=price)
            self.label3.grid(row=row_counter, column=3)
            row_counter += 1

        self.label4 = Label(master, text="model {} is chosen".format(var1.get()))
        self.label4.grid(row=row_counter, column=1)
        row_counter += 1

        self.label5 = Label(master, text="Reel Size Selection")
        self.label5.grid(row=row_counter, column=1)
        row_counter += 1

        var2 = IntVar(master)

        if var1.get() == 0:
            self.reelbutton = Radiobutton(master, text=reels[0], variable=var2, value=0, indicatoron=False,
                                                activebackground="green", width=12)
            self.reelbutton.grid(row=row_counter, column=1)
            row_counter += 1
            row_counter = 10
            self.label6 = Label(master, text=reel_prices[0])
            self.label6.grid(row=row_counter, column=3)

        elif 1 <= var1.get() <= 2:
            self.reelbutton = Radiobutton(master, text=reels[1], variable=var2, value=1, indicatoron=False,
                                                activebackground="green", width=12)
            self.reelbutton.grid(row=row_counter, column=1)
            self.label6 = Label(master, text=reel_prices[1])
            self.label6.grid(row=row_counter, column=3)
            row_counter += 1
            self.reelbutton = Radiobutton(master, text=reels[2], variable=var2, value=2, indicatoron=False,
                                            activebackground="green", width=12)
            self.reelbutton.grid(row=row_counter, column=1)
            self.label7 = Label(master, text=reel_prices[2])
            self.label7.grid(row=row_counter, column=3)
            row_counter += 1

        elif 3 <= var1.get() <= 4:
            self.reelbutton = Radiobutton(master, text=reels[3], variable=var2, value=3, indicatoron=False,
                                                activebackground="green", width=12)
            self.reelbutton.grid(row=row_counter, column=1)
            self.label6 = Label(master, text=reel_prices[3])
            self.label6.grid(row=row_counter, column=3)
            row_counter += 1
            self.reelbutton = Radiobutton(master, text=reels[4], variable=var2, value=4, indicatoron=False,
                                            activebackground="green", width=12)
            self.reelbutton.grid(row=row_counter, column=1)
            self.label7 = Label(master, text=reel_prices[4])
            self.label7.grid(row=row_counter, column=3)
            row_counter += 1

        elif var1.get() == 5:
            self.reelbutton = Radiobutton(master, text=reels[5], variable=var2, value=5, indicatoron=False,
                                                activebackground="green", width=12)
            self.reelbutton.grid(row=row_counter, column=1)
            self.label6 = Label(master, text=reel_prices[5])
            self.label6.grid(row=row_counter, column=3)
            row_counter += 1
            self.reelbutton = Radiobutton(master, text=reels[6], variable=var2, value=6, indicatoron=False,
                                            activebackground="green", width=12)
            self.reelbutton.grid(row=row_counter, column=1)
            self.label7 = Label(master, text=reel_prices[6])
            self.label7.grid(row=row_counter, column=3)
            row_counter += 1

        row_counter += 1
        self.label8 = Label(master, text="Total unit price as built: {}".format(model_prices[var1.get()] +
                                                                                reel_prices[var2.get()]))
        self.label8.grid(row=row_counter, column=3)
        row_counter += 1





root = Tk()
my_gui = pricingDoc(root)
root.mainloop()

Answer 1

根据我在您的代码中看到和测试的内容，在我看来，elif 并不像封装在单击单选按钮时调用的函数中。

为了测试这个理论，我在 showchoice 函数中加入了一个 print(var1.get())，它会在每次点击时打印出新的索引。因此，为了更进一步，我将 label4 创建行也移到了该函数中，它会正确更新表单。

所以在我看来，elif 块似乎需要封装到一个函数中，每次单击单选按钮时都会调用（并因此更新）该函数。

我希望这会有所帮助，或者至少能让您走上正确的道路。我看不出为什么单选按钮不能或不应该用于您正在做的事情！

~干杯！