python 有一分数序列：2/1, 3/2,5/3, 8/5,13/8 ，21/13...求出返个数列的前20項之和

Sure, the sum of the first 20 terms of the given sequence is 32.66026079864264. You can find the code to calculate the sum as follows:

a, b = 2, 1
total = 0

for i in range(20):
    total += a / b
    a, b = a + b, a

print(total)