from functools import reduce
def sigma(i,j):
return reduce(lambda a, x: a + x, [0]+list(range(i,j+1)))
print(sigma(1,10000))
python计算sigma
from functools import reduce
def sigma(i,j):
return reduce(lambda a, x: a + x, [0]+list(range(i,j+1)))
print(sigma(1,10000))