获取按钮事件的错误在wxPython中

Question

我面临着以下问题 - 每当我试图让一个事件侦听器的任何我的按钮，我得到了以下错误：

self.button_compute.Bind(wx.EVT_BUTTON, self.on_click) 
    AttributeError: 'BMICalculator' object has no attribute 'button_compute' 

我尝试了建议的解决方案在这个线程：AttributeError: 'module' object has no attribute 'PyScrolledWindow' in wxPython，但它不适合我。

程序是计算BMI和下面的代码：

import wx 

class BMICalculator(wx.Frame): 
    def __init__(self, parent, id): 
     wx.Frame.__init__(self, parent, id, "BMI calculator", (600, 800)) 
     panel = wx.Panel(self) 
     self.Centre() 
     #Creating the buttons and text fields 
     static_text_height = wx.StaticText(panel, -1, "Height", (170, 10)) 
     height = wx.SpinCtrl(panel, -1, pos=(164, 40), size=(60, -1)) 
     static_text_weight = wx.StaticText(panel, -1, "Weight", (170, 100)) 
     weight = wx.SpinCtrl(panel, -1, pos=(164, 130), size=(60, -1)) 

     button_compute = wx.Button(panel, label="Compute", pos=(110, 180), size=(60, -1)) 
     button_cancel = wx.Button(panel, label="Cancel", pos=(210, 180), size=(60, -1)) 

     result_text = wx.StaticText(panel, -1, "Enter your height and weight and press compute", (68, 220)) 
     #Adding the events for the buttons (Where I get the error) 
     self.button_compute.Bind(wx.EVT_BUTTON, self.on_click) 

     self.button_cancel.Bind(wx.EVT_CLOSE, self.click_close) 

    def compute_BMI(height, weight): 
     #BMI = x KG/(y M * y M) 
     height_m = height/100 
     BMI = weight/(height_m * height_m) 
     return BMI 

    def click_close(self, event): 
     self.Close(True) 

    def on_click(self, event): 
     result_text.SetValue(compute_BMI(height.GetValue(), weight.GetValue())) 

def main(): 
    app = wx.App() 
    frame = BMICalculator(None, -1) 
    frame.Show() 
    app.MainLoop() 
    enter code here 

if __name__ == '__main__': 
    main() 

任何帮助将不胜感激！

Answer 1

当您创建button_compute时，将其作为函数的局部变量保留。当您尝试绑定事件时，您会尝试从尚未创建的实例属性读取。你在很多情况下都会这样做，但是你的脚本在第一个脚本中出错了。将self.xxx添加到您的分配中，以便为该函数创建实例属性而不是局部变量。

import wx 

class BMICalculator(wx.Frame): 
    def __init__(self, parent, id): 
     wx.Frame.__init__(self, parent, id, "BMI calculator", (600, 800)) 
     self.panel = wx.Panel(self) 
     self.Centre() 
     #Creating the buttons and text fields 
     self.static_text_height = wx.StaticText(self.panel, -1, "Height", (170, 10)) 
     self.height = wx.SpinCtrl(self.panel, -1, pos=(164, 40), size=(60, -1)) 
     self.static_text_weight = wx.StaticText(self.panel, -1, "Weight", (170, 100)) 
     self.weight = wx.SpinCtrl(self.panel, -1, pos=(164, 130), size=(60, -1)) 

     self.button_compute = wx.Button(self.panel, label="Compute", pos=(110, 180), size=(60, -1)) 
     self.button_cancel = wx.Button(self.panel, label="Cancel", pos=(210, 180), size=(60, -1)) 

     self.result_text = wx.StaticText(self.panel, -1, "Enter your height and weight and press compute", (68, 220)) 
     #Adding the events for the buttons (Where I get the error) 
     self.button_compute.Bind(wx.EVT_BUTTON, self.on_click) 

     self.button_cancel.Bind(wx.EVT_CLOSE, self.click_close) 

    def compute_BMI(height, weight): 
     #BMI = x KG/(y M * y M) 
     height_m = height/100 
     BMI = weight/(height_m * height_m) 
     return BMI 

    def click_close(self, event): 
     self.Close(True) 

    def on_click(self, event): 
     self.result_text.SetValue(self.compute_BMI(self.height.GetValue(), self.weight.GetValue())) 

def main(): 
    app = wx.App() 
    frame = BMICalculator(None, -1) 
    frame.Show() 
    app.MainLoop() 
    #enter code here 

if __name__ == '__main__': 
    main()