wxPython: How to clear default text in TextCtrl with one click

I think you want

def toggle1(evt):
    if self.boxQuantity.GetValue() == "Enter quantity":
        self.boxQuantity.SetValue("")
    evt.Skip()
def toggle2(evt):
    if self.boxQuantity.GetValue() == "":
        self.boxQuantity.SetValue("Enter quantity")
    evt.Skip()    

self.boxQuantity.Bind(wx.EVT_FOCUS,toggle1)
self.boxQuantity.Bind(wx.EVT_KILL_FOCUS,toggle2)

its probably better to create a subclass

import wx
class PlaceholderTextCtrl(wx.TextCtrl):
    def __init__(self, *args, **kwargs):
        self.default_text = kwargs.pop("placeholder", "")
        wx.TextCtrl.__init__(self, *args, **kwargs)
        self.OnKillFocus(None)
        self.Bind(wx.EVT_SET_FOCUS, self.OnFocus)
        self.Bind(wx.EVT_KILL_FOCUS, self.OnKillFocus)

    def OnFocus(self, evt):
        self.SetForegroundColour(wx.BLACK)
        if self.GetValue() == self.default_text:
            self.SetValue("")
        evt.Skip()

    def OnKillFocus(self, evt):
        if self.GetValue().strip() == "":
            self.SetValue(self.default_text)
            self.SetForegroundColour(wx.LIGHT_GREY)
        if evt:
            evt.Skip()

# then sometime later...

self.text_entry1 = PlaceHolderTextCtrl(self,-1,placeholder="Enter Value")

something like that at least ...

I know that this question is old, but wxPython now (4.1) has a new SetHint function for a TextCtrl:

text = wx.TextCtrl(self)
text.SetHint('First name')  # This text is grey, and disappears when you type