You could do this using the filter function as follows:
F = [1, 2]
while F[-1] < 4000000:
F.append(F[-1] + F[-2])
print(F)
print('\n')
#create the variable that could store the sorted values from the list you have created.
sorted_number=list(filter(lambda x:x%2==0,F))
print(sorted_number)