Question

i = 0
num = 0
while i <= 1000:
    if i % 3 and i % 5 == 0:
        num + i = num <--- Adding Up Numbers Divisable by 3 & 5...
    i += 1
print num

Error:* can’t assign to operator (line 5)

Answer 1

Are you sure you don’t want:

num = num + i

or equivalently:

num += i

?

Note that this can be done a little easier using sum, range and a generator expression:

sum( x for x in range(0,1000,5) if x % 3 == 0 )
                            #^only take every 5th element (0, 5, 10, 15 ...)
                                    #^ Also only take elements divisible by 3

If you’re planning on running this code on only python 2.x, you can change range to xrange in the above expression. Also, when reading other people’s code, you’ll sometimes see if x % 3 == 0 written as if not x % 3 in this type of context, but I prefer the first version (it seems a little more explicit to me).