A=[1,2,3,4,5]
print(sum(A[:3]))
这样行不行A=[1,2,3,4,5]suma=0for i in range(3):suma += A[i]print(suma) 结果python3 a.py 6
l = [1,2,3,4,5]s = 0for x in range(3):s = s + l[x]print(s)
