Basically I need help in generating even numbers from a list that I have created in Python:
[1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597
Just check this
A = [i for i in range(101)]
B = [x for x in A if x%2 == 0]
print B
Instead of generating all Fibonacci numbers then filtering for evens, why not generate just the even values?
def even_fibs():
a,b = 1,2
while True:
yield b
a,b = a+2*b, 2*a+3*b
generates [2, 8, 34, 144, 610, 2584, 10946 ...]
then your sum code becomes:
total = 0
for f in even_fibs():
if f >= 4000000:
break
else:
total += f
or
from itertools import takewhile
total = sum(takewhile(lambda n: n<4000000, even_fibs()))