Bugs item #1175022, was opened at 2005-04-01 20:09
Message generated for change (Settings changed) made by gbrandl
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Category: Documentation
Group: Python 2.4
Status: Closed
Resolution: Fixed
Priority: 5
Submitted By: John Ridley (ojokimu)
>Assigned to: Georg Brandl (gbrandl)
Summary: property example code error
Initial Comment:
The example code for 'property' in lib/built-in-funcs.html may
produce an error if run "as is":
Python 2.4.1 (#1, Mar 31 2005, 21:33:58)
[GCC 3.4.1 (Mandrakelinux (Alpha 3.4.1-3mdk)] on linux2
>>> class C(object):
... def getx(self): return self.__x
... def setx(self, value): self.__x = value
... def delx(self): del self.__x
... x = property(getx, setx, delx, "I'm the 'x' property.")
...
>>> c=C()
>>> c.x
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<stdin>", line 2, in getx
AttributeError: 'C' object has no attribute '_C__x'
The same goes for 'del c.x' (although not 'c.x = 0', of course).
A more "typical" way of defining managed attributes would be to
include an 'init' as follows:
class C(object):
def __init__(self): self.__x = None
def getx(self): return self.__x
def setx(self, value): self.__x = value
def delx(self): del self.__x
x = property(getx, setx, delx, "I'm the 'x' property.")
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Comment By: Georg Brandl (birkenfeld)
Date: 2005-06-25 20:08
Message:
Logged In: YES
user_id=1188172
Thanks for the report; fixed as Doc/lib/libfuncs.tex r1.184,
r1.175.2.4.
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Comment By: Sean Reifschneider (jafo)
Date: 2005-04-06 03:33
Message:
Logged In: YES
user_id=81797
I agree, adding the __init__ to set a value would be useful. +1
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