Python: I was practicing writing code to answer a problem on ProjectEuler, but it keeps giving me wrong answer.

Question

The question was:
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.

The code I wrote:
i = 1
ans1 = 0
num1 = 0

while ans1 <= 1000:
ans1 = i * 3
if ans1 <= 999:
print(ans1)
num1 = num1 + ans1
i += 1

i = 1
ans2 = 0
num2 = 0

while ans2 <= 1000:
ans2 = i * 5
if ans2 <= 1000:
print(ans2)
num2 = num2 + ans2
i += 1

else:
print("""
Answer is: """)
print(num1+num2)

The answer the code above is giving me is 269340, but the site says that that's the wrong answer. Please help.

Answer 1

Check this:
i = 1
ans1 = 0
num1 = 0

while ans1 <= 1000:
ans1 = i * 3
if ans1 <= 999:
print(ans1)
num1 = num1 + ans1
i += 1

i = 1
ans2 = 0
num2 = 0

while ans2 <= 1000:
ans2 = i * 5
if ans2 <= 1000:
print(ans2)
num2 = num2 + ans2
i += 1

else:
print("""
Answer is: """)
print(num1+num2)

I check it with smallest numbers (not below 1000 but 10 => easier find mistake) and work fine.
You miss one space before 'num1 = num1 + ans1' and 'num2 = num2 + ans2' and interpreter sum numbers with every while loop without if condiction. I hope I helped

Answer 2

Thanks Marek Kazimierczak for the response, but that wasn't it.

After trial and error I realized that some of the multiples of 3 are also multiples of 5. So it was adding those specific numbers twice. So, I created a third while loop to add up all the multiples of 15 and subtract that from the total.

Final code was:
i = 1
ans1 = 0
num1 = 0

while ans1 <= 1000:
ans1 = i * 3
if ans1 <= 1000:
print(ans1)
num1 = num1 + ans1
i += 1

i = 1
ans2 = 0
num2 = 0

while ans2 <= 995:
ans2 = i * 5
if ans2 <= 995:
print(ans2)
num2 = num2 + ans2
i += 1

i = 1
ans3 = 0
num3 = 0

while ans3 <= 1000:
ans3 = i * 15
if ans3 <= 1000:
print(ans3)
num3 = num3 + ans3
i += 1

else:
print("""
Answer is: """)
print(num1+num2-num3)

But thanks for pointing out the missing space, I am practicing on notepad and it gets a bit confusing.