Fredrik Lundh wrote:
Iain Day wrote:
def edit_preferences(event=None):
prefs = Preferences(master, title="Preferences")
class Preferences(tkSimpleDialog.Dialog):
def body(self, master):
settings = tk.LabelFrame(master, text="Settings")
settings.grid(row=0, column=0)
tk.Label(settings, text="Angular Units: ").grid(row=0,
column=0, sticky=tk.E)
angles = tk.StringVar(value='radians')
self.angles = angles # keep a reference to the variable
tk.Radiobutton(settings, text="Degrees",
variable=angles,value='degrees').grid(row=0, column=1)
tk.Radiobutton(settings, text="Radians",
variable=angles,value='radians').grid(row=0, column=2)
Widgets don't keep references to their option values, so unless you
explicitly keep a reference to the variable yourself (e.g. via an
instance attribute, as above), it'll be removed at the end of the method.
Okay, thanks. Not quite sure I follow though, later in my code I have
tk.Label(files, text="Working dir: ").grid(row=0, column=0, sticky=tk.E)
tk.Entry(files, textvariable=workdir).grid(row=0, column=1, sticky=tk.W)
and this worked okay, without the self.var = var bit. Is there a
difference between the two?
Thanks,
Iain
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