fib

gistfile1.txt

import itertools

def fibonacci_generator():
    a, b = 1, 2
    while True:
        yield a
        a, b = b, a + b

def calculate_even_fibonacci_sum(limit):
    even_fibs = filter(lambda n: n%2 == 0, fibonacci_generator())
    even_fibs_less_than_4m = itertools.takewhile(lambda x: x <= limit, even_fibs)
    even_sum = sum(even_fibs_less_than_4m)
    return even_sum

# Set the limit to 4 million
limit = 4000000

# Calculate and print the sum
result = calculate_even_fibonacci_sum(limit)
print(f"The sum of even Fibonacci numbers less than {limit} is: {result}")