利用递归求解

def sum_1(num):
    if num == 1:
        return 1
    else:
        return num + sum_1(num-1)

用 最笨的方法求解：

def sum_2():
    sum = 0
    for i in range(101):
        sum = sum+i
    return sum

用python牛逼的sum求解：

def sum_3():
    return sum(range(1,101))

用奇偶相加求解：

def sum_4():
    value = 0
    value_1 = 0
    for i in range(1,101):
        if i%2 == 0:
            value = value + i
        else:
            value_1 = value_1 + i
    return value + value_1