Python Syntax doubt

Question

Hey, I have been using the Pymt library and they have this convention to referring their widgets:

from pymt import *

# create a slider from 0.-1.
sl = MTXYSlider()

@sl.event
def on_value_change(x, y):
    print 'Slider value change', x, y

runTouchApp(sl)

what's with the "@"? What does it signify in Python?Thanks.

How sad that the Python tutorials weren't working. Which tutorial have you been using? How long has it been down? — S.Lott
– S.Lott, Commented Oct 27, 2010 at 10:23

John La Rooy · Accepted Answer · 2010-10-27 08:40:21Z

3

It signifies a decorator

answered Oct 27, 2010 at 8:40

John La Rooy

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mossplix · Accepted Answer · 2010-10-27 08:46:17Z

0

basically it is a function that takes another function as an argument . if is a way python implements a Decorator Pattern.

the equivalent code would be


sl.event(on_value_change(x, y))

answered Oct 27, 2010 at 8:46

mossplix

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