Project Euler question #2 solved in Python

Question 2 is:

Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...

By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

My not very elegant solution is:

a = 0
b = 1
t = 0
while b < 4000001:
  if (a+b) % 2 == 0:
    t += (a+b)
  b = (a+b)
  a = (b-a) print t