Greetings, List!
I was browsing through the Decimal source today, and found this:
# We're immutable, so use __new__ not __init__
def __new__. . .
self = object.__new__(cls)
.
.
.
return self
Out of curiousity I then tried this:
--> import decimal
--> d25 = decimal.Decimal(25)
--> d25
Decimal("25")
--> d25._int
(2, 5)
--> d25._int = (1, 5)
--> d25
Decimal("15")
--> d25 + 15
Decimal("30")
If Decimals were really immutable, that should not have worked -- so in
what sense are they immutable? Does Python treat them as immutable if
they are created with __new__ instead of __init__?
Any pointers to appropriate docs also greatly appreciated.
~Ethan~
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