Mark Young wrote:
I created a custom vector type, inheriting from object, and defined
__mul__, __add__, etc. Unfortunately, the operators only work if I
type "vector * (int/float/number)", in that exact order. My program
produces an error if I instead type "number * vector".
Use __rmul__, __radd__, etc.
This makes sense to me, because I haven't told the number (int, float,
whatever) how to deal with an object of type vector, (At least, I
think that's why it doesn't work.). Is there any way to allow
"number (operator) vector", short of modifying the standard types'
behavior?
Here's an example of the error.
vec1 = vector(5,6,7)
>>> vec1 * 2
(10, 12, 14)
>>> 2 * vec1
Traceback (most recent call last):
File "<pyshell#9>", line 1, in <module>
2 * vec1
TypeError: unsupported operand type(s) for *: 'int' and 'vector'
I'm using python 3.1.
Thanks.
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Bob Gailer
919-636-4239
Chapel Hill NC
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