Question

我正在创建Python tkinter程序，访问用户输入值。然后，用户将从单选按钮中选择包括华氏度或摄氏度的选项。将显示消息显示用户选择的选项，按下计算按钮时，新的转换的华氏度或摄氏值将显示在计算按钮后面的标签上。我构建了基于View Model Control的程序，当我执行主程序时，我已经跟踪错误：

AttributeError: 'Calculate' object has no attribute 'radioButtonShowChoice'

我有3个独立的文件，用于View Model Control架构第一个被命名为视图框架：

import tkinter
class AppFrame(tkinter.Frame):
    """
    class AppFrame is the View for a simple program converts between temperature
    in Fareinheit and tempterature in Celicus
    """
    def __init__(self, controller):
        tkinter.Frame.__init__(self)   # initializes the superclass
        self.pack()   #  required in order for the Buttons to show up properly
        self.controller = controller
        v = tkinter.IntVar()
        self.titleLabel1 = tkinter.Label(self)
        self.titleLabel1["text"] = "Fahrenheit and Celcius converter program"
        self.titleLabel1.pack()

        self.titleLabel2 = tkinter.Label(self)
        self.titleLabel2["text"] = "Enter your value here:"
        self.titleLabel2.pack({"fill":"x","padx":"10"})

        self.entryData = tkinter.Entry(self)
        self.entryData.pack({"fill":"x","padx":"10"})

        self.titleLabel3 = tkinter.Label(self)
        self.titleLabel3["text"] = "Choose options bellow:"
        self.titleLabel3.pack({"fill":"x","padx":"10"})

        self.radioButton1 = tkinter.Radiobutton(self,text="Fahreinheit", variable = v, value =1 )
        self.radioButton1["command"] = self.controller.radioButtonShowChoice
        self.radioButton1.pack({"anchor":"w"})

        self.radioButton2 = tkinter.Radiobutton(self,text="Celcius", variable = v, value = 2)
        self.radioButton2["command"] = self.controller.radioButtonShowChoice
        self.radioButton2.pack({"anchor":"w"})

        self.resultLabel1 = tkinter.Label(self)
        self.titleLabel1.pack({"fill":"x","padx":"10"})

        self.calculateButton = tkinter.Button(self)
        self.calculateButton["text"] = "CALCULATE"
        self.calculateButton["command"] = self.controller.buttonCalculate
        self.calculateButton.pack({"fill":"x","padx":"10"})

        self.resultLabel2 = tkinter.Label(self)
        self.titleLabel2.pack({"fill":"x","padx":"10"})

第二个被命名为模型计算

import tkinter
import frame
class Calculate:
    """
    Class Calculate is the Model for calculating the convert to Fahreinheit or Celcius
    It also displays the result on the screen
    """
    def __init__(self):
        self.newValue = 0
        self.view = frame.AppFrame(self)

    def displayChoice(self):
        if str(self.view.v.get()) == "1":
            return "You chose option 1 for Fahreinheit converter"
        elif str(self.view.v.get()) == "2":
            return "You chose option 2 for Celcius converter"

    def displayResult(self):
        if str(self.view.v.get()) == "1":
            self.newValue = (9/5 * int(self.view.entryData.get())) + 32
        elif str(self.view.v.get()) == "2":
            self.newValue = 5/9 * (int(self.view.entryData.get()) - 32)

    def __str__(self):
        return str(self.newValue)

最后一个是主程序，名为myMain for Controller

import tkinter
import frame
import calculate

class Display:
    """
    The Display class for an app that follows the Model/View/Controller architecture.
    When the user presses the Button converter on the View, this Display calles the appropriate methods in the Model.
    """
    def __init__(self):       
        root = tkinter.Tk()
        self.model = calculate.Calculate()
        self.view = frame.AppFrame(self)
        self.view.mainloop()
        root.destroy()

    def radioButtonShowChoice(self):
        self.view.resultlabel1["text"] = self.model.displayChoice

    def buttonCalculate(self):
        self.model.displayResult()
        self.view.resultLabel2["text"] = "The new value of tempreature is "+str(self.model
if __name__ == "__main__":
    d = Display()

任何帮助使这个程序工作将不胜感激感谢

Answer 1

在Display.__init__(self)

self.model = calculate.Calculate()

在Calculate.__init__(self)

self.view = frame.AppFrame(self)

在AppFrame.__init__(self, controller)

self.controller = controller
...

self.radioButton1["command"] = self.controller.radioButtonShowChoice
self.radioButton2["command"] = self.controller.radioButtonShowChoice

self.controller是传递给AppFrame构造函数的值，它是一个Calculate对象。您正尝试分配radioButtonShowChoice，Calculate不是Display中的属性，如错误消息所示。我假设您要从AppFrame分配函数。您还创建了两个让我感到困惑的Calculate - 一个在Display对象中，另一个在AppFrame个对象中。

在您的实施中，Display需要AppFrame中的函数，因此Display在某些时候需要引用Calculate - AppFrame instance #1 Display - AppFrame instance #2, Calculate object AppFrame #1 - Calculate as the controller AppFrame #2 - Display as the controller - 从计算内部创建的第一个函数不会有这个参考。

{{1}}

最后，带错误消息的地方应该是一个堆栈跟踪，指向发生错误的行号。那真的很重要。

错误Python tkinter程序

1 个答案: