At Monday 15/1/2007 19:28, Jim B. Wilson wrote:
Am I nuts? Or only profoundly confused? I expected the this little script
to print "0":
class foo(int):
def __init__(self, value):
self = value & 0xF
print foo(0x10)
Instead, it prints "16" (at least on python 2.4.4 (Linux) and 2.5 (Wine).
Integers are immutable. Insert a print statement and you'll see your
__init__ is never called. Anyway, what would you expect from "self =
something"?
Use __new__ instead:
py> class foo(int):
... def __new__(cls, value):
... return int(value & 0xF)
...
py> foo(1)
1
py> foo(0x10)
0
See "Special method names" inside the Python Reference Manual.
--
Gabriel Genellina
Softlab SRL
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