# calculation on lists

L

#### loïc Lauréote

I found something allowing to avoid loops.

import math

class Vector:
def __init__(self, x=0, y=0):
self.x=x
self.y=y
def __eq__(self, vB): return (self.x==vB.x) and (self.y==vB.y)
def __sub__(self, vB): return Vector(self.x-vB.x,self.y-vB.y)
def __mul__(self, c):
if isinstance(c,Vector): return Vector(self.x*c.x,self.y*c.y)
else: return Vector(c*self.x,c*self.y)

def __div__(self, c):
if isinstance(c,Vector): return Vector(self.x/c.x,self.y/c.y)
else: return Vector(c*self.x,c*self.y)

a = Vector(4,5)
b = Vector(6,7)
print a,b
print b*b+a

thx

Date: Wed, 19 Dec 2012 13:38:28 +0100
Subject: Re: calculation on lists

2012/12/19 loïc Lauréote <[email protected]>:
hi,
I
have a question,
is there a tool to calculate on list ?

something like :
a= [1,1,1,1]
b = [5,9,8,4]
c = a+b*a
print c
[6,10,9,5]

Thx

======

Hi,
for such simpler cases, you may try list comprehensions and probably
the zip(...) function
[a+b*a for a,b in zip([1,1,1,1], [5,9,8,4])] [6, 10, 9, 5]

hth,
vbr