Return Values & lambda

Steven D'Aprano steve+comp.lang.python at
Tue Feb 22 01:59:30 CET 2011

On Mon, 21 Feb 2011 16:43:49 -0800, Rafe Kettler wrote:

> On Feb 21, 1:59 pm, pradeepbpin <pradeepb... at> wrote:
>> I have a main program module that invokes an input dialog box via  a
>> menu item. Now, the code for drawing and processing the input of dialog
>> box is in another module, say ''. I connect the menu item to
>> this dialog box by a statement like,
>> manu_item.connect('activate', lambda a: dialogs.open_dilaog())
>> If this function open_dialog() returns a list of dialog inputs values,
>> how can I access those values in the main module ?
> Moreover, I don't see why you need a lambda in this case. Why not just
> pass the function itself?

My guess is that the callback function is passed a single argument, and 
open_dialog doesn't take any arguments, hence the wrapper which just 
ignores the argument and calls the function.


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