Dave Opstad wrote:
I'm hoping someone can point out where I'm going wrong here. Here's a
snippet of a Python interactive session (2.3, if it makes a difference):
--------------------------------------
class X(list):
... def __init__(self, n):
... v = range(n)
... list.__init__(self, v)
...
x = X(10)
x
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
class Y(tuple):
... def __init__(self, n):
... v = tuple(range(n))
... tuple.__init__(self, v)
...
y = Y(10)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: iteration over non-sequence
--------------------------------------
How do I initialize instances of a class derived from tuple, if it's not
in the __init__ method?
In the __new__ method! This must return the actual created object,
whereas __init__ initializes the already-created object.
This applies to subclassing all the built-in types.
regards
Steve
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