Vector classes
Mark Dickinson
dickinsm at gmail.com
Sun Apr 22 17:30:52 CEST 2007
On Apr 22, 8:33 am, Mizipzor <mizip... at gmail.com> wrote:
> With 1, I can typ vec.x and vec.y, very nice. With 2, I need to do
> vec.vals[0] and vec.vals[1], which makes my eyes bleed.
If you add a __getitem__ method to the second vector class:
def __getitem__(self, i):
return self.vals[i]
then you can use vecs[0] instead of vec.vals[0]. But this vector
class has some other problems that you probably want to fix. For
example, the __add__ method modifies the second argument:
>>> a = Vector([1, 2, 3])
[1, 2, 3]
>>> b = Vector([4, 5, 6])
[4, 5, 6]
>>> c = a + b
>>> print b.vals
[5, 7, 9]
Something like
def __add__(self, other):
return Vector(x + y for x, y in zip(self.vals,
other.vals))
might work better. Similarly for the __sub__ method.
Have you considered using numpy?
Mark
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