Perfect. Thanks.
Paul Rubin wrote: > "Jay" <[EMAIL PROTECTED]> writes: > > > I'm having a problem using lambda to use a command with an argument for > > a button in Tkinter. > > > > buttons = range(5) > > for x in xrange(5): > > > self.highlight(x)) > > buttons[x].pack(side=LEFT) > > > > The buttons are correctly numbered 1 through 5, but no matter which > > button I click on, it sends the number 4 as an argument to the > > highlight function. > > x is not bound by the lambda and so the lambda body gets it from the > outside environment at the time the body is executed. You have to > capture it at the time you create the lambda. There's an ugly but > idiomatic trick in Python usually used for that: > > buttons[x] = Button(frame, text=str(x+1), \ > command=lambda x=x: self.highlight(x)) > > See the "x=x" gives the lambda an arg whose default value is set to > x at the time the lambda is created, as opposed to when it's called. -- http://mail.python.org/mailman/listinfo/python-list
