有一分数列2/1,3/2,5/3,8/5,13/8,21/13...求出这个数列的前20项的和

l = [1,1]
l1 = []
[l.append(l[x] + l[x + 1]) for x in range(20)]
print(l)
print(len(l))
[l1.append(l[y + 2]/l[y + 1]) for y in range(20)]
print(l1)
print(len(l1))
print(sum(l1))

l = [1,1]
m = []
for x in range(20):
    l.append(l[x] + l[x + 1])
    m.append(l[x + 2]/l[x + 1])
print(len(m))
print(sum(m))