在wxpython中保存combobox的选中值

Question

我正在用wxpython设计一个图形界面，其中有一段代码是关于一个类的声明，还有一些我想根据下拉框选择来改变值的变量。

我做了以下操作：

class myMenu(wx.Frame):
def __init__(self, parent, id, title):
    wx.Frame.__init__(self, parent, id, title, size=(900, 700))

    self.ct = 0
    self.phaseSelection = ""
    self.opSelection = ""
    self.instSelection = ""
    self.orgSelection = ""

    panel = wx.Panel(self, -1)       
    panel.SetBackgroundColour('#4f3856')

    phasesList = ["preOperations", "inOperations", "postOperations"]

    self.cbPhases = wx.ComboBox(panel, 500, 'Phase', (50, 150), (160,-1), phasesList, wx.CB_DROPDOWN)

    self.Bind(wx.EVT_COMBOBOX, self.OnPhaseSelection, id = self.cbPhases.GetId()) 

这是“OnPhaseSelection”事件的代码：

def OnPhaseSelection(self, event):
    self.phaseSelection = self.cbPhases.GetValue()

我想把选中的值保存到我之前声明的变量“self.phaseSelection”中，最开始这个变量是一个空字符串。然后我想用这个变量的新值，但当我运行程序时，这个变量却还是下拉框的默认值！请问我的代码哪里出了问题？

Answer 1

我不太确定哪里出了问题。看起来应该是可以正常工作的。我把大部分内容复制过来，做了一个可以在Windows上运行的示例：

import wx

########################################################################
class MyForm(wx.Frame):

    #----------------------------------------------------------------------
    def __init__(self):
        wx.Frame.__init__(self, None, wx.ID_ANY, "Tutorial")
        panel = wx.Panel(self, wx.ID_ANY)

        self.ct = 0
        self.phaseSelection = ""
        self.opSelection = ""
        self.instSelection = ""
        self.orgSelection = ""

        phasesList = ["preOperations", "inOperations", "postOperations"]

        self.combo = wx.ComboBox(panel, choices=phasesList)
        self.combo.Bind(wx.EVT_COMBOBOX, self.onCombo)

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.combo)
        panel.SetSizer(sizer)

    #----------------------------------------------------------------------
    def onCombo(self, event):
        """
        """
        self.phaseSelection = self.combo.GetValue()
        print self.phaseSelection

#----------------------------------------------------------------------
# Run the program
if __name__ == "__main__":
    app = wx.App(False)
    frame = MyForm().Show()
    app.MainLoop()