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.
In [26]:
def fib_gen(limit):
f = 1
s = 2
while f < limit:
yield f
f, s = s, f + s
In [30]:
sum( i for i in fib_gen(4e+6) if i%2 == 0)
Out[30]:
In [27]:
[i for i in fib_gen(10)]
Out[27]: