david.mcwright at usbfmi.com
Fri Aug 14 00:17:56 CEST 2009
I am new to Python and I have a question about descriptors. If I have
a class as written below, is there a way to use descriptors to be
certain that the datetime in start is always before the one in end?
def __init__(self,a = None,b = None)
self.start = a
self.end = b
from datetime import datetime
c = datetime(2009,8,13,6,15,0)
d = datetime(2009,8,14,12,0,0)
afoo = foo(c,d)
For instance, if the following code were run, I would like to instance
of foo to switch the start and end times.
afoo.start = datetime(2010,8,13,6,15,0)
I was thinking of using the __set__ descriptor to catch the assignment
and reverse the values if necessary, but I can't figure out how to
determine which values is being set.
Thanks for the help!
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