On 7/18/2011 3:23 PM, woooee wrote:
Partial can be used in a GUI program, like Tkinter, to send arguments
to functions. There are other ways to do that as well as using
partial. The following program uses partial to send the color to the
change_buttons function.
from Tkinter import *
from functools import partial
class App:
def __init__(self, parent):
self.my_parent = parent
self.my_parent.geometry("200x100+10+10")
self.R = list()
for ctr, color in enumerate(("Red", "Blue", "Green")):
btn = Radiobutton(self.my_parent, text=color, value=ctr+1,
command=partial(self.change_buttons, color))
btn.grid(row = 2, column = ctr+1)
This is a nice illustration. For future reference: enumerate now takes a
start value as second parameter. Given as 1, you do not need to remember
to add 1 for each usage.
for ctr, color in enumerate(("Red", "Blue", "Green"),1):
btn = Radiobutton(self.my_parent, text=color, value=ctr,
command=partial(self.change_buttons, color))
btn.grid(row = 2, column = ctr)
btn.deselect()
self.R.append(btn)
self.R[0].select()
self.change_buttons("Red")
def change_buttons(self, color):
self.my_parent.configure(bg=color)
for btn in self.R:
btn.configure(bg=color)
if __name__ == "__main__":
root = Tk()
root.title ("Color Option")
app = App(root)
root.mainloop()
--
Terry Jan Reedy
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