Hi,
I am just reading about properties in Python. I am thinking
of this as an indirection mechanism, is that wrong? If so, how
come the getter/setters aren't called when I use properties
instead of the functions directly?
What am I missing here? I have a feeling I am overlooking
something simple here...
Thanks,
Esmail
---
#!/usr/bin/env python
#
# quick test to deal with 'private' attributes and
# python properties ...
#
import sys
class Rectangle(object):
def __init__(self):
self.__width = 0
self.__height = 0
def setSize(self, width, height):
print 'in setter'
if (width < 0) or (height < 0):
print >> sys.stderr, 'Negative values not allowed'
else:
self.__width = width
self.__height = height
def getSize(self):
print 'in getter'
return self.__width, self.__height
size = property(getSize, setSize)
r = Rectangle()
print r.getSize()
r.setSize(-40, 30)
print r.getSize()
print '-----------------'
size = 3, 7
print size
print '-----------------'
size = -3,7
print size
The program output:
in getter
(0, 0)
in setter
Negative values not allowed
in getter
(0, 0)
-----------------
(3, 7)
-----------------
(-3, 7)
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