No.1 The sum of all the multiples of 3 or 5 below 1000

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.

Find the sum of all the multiples of 3 or 5 below 1000.

A:
#! /usr/bin/env python

#method 1
find = reduce(lambda x,y:x+y,[x for x in xrange(3,1000) if not x%3 or not x%5])
print find

#method 2
result = 0
for i in range(1,1000):
    if not i%3 or not i%5:
        result += i
print "result=%s" %result

#method3
num = reduce(lambda x,y:x+y,[x for x in filter(lambda a: not a%3 or not a%5,range(1,1000))])
print "num=%s" %num