def sum_even_fib(n): """Calculates sum of even-valued terms up to n in Fibonacci series.""" a = 1 b = 2 total_of_evens = 0 while b < 4000000: if b % 2 == 0: total_of_evens += b old_a = a old_b = b a = old_b b = old_a + old_b return total_of_evens print(sum_even_fib(4000000))
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