python编写一个函数，输入n为偶数时，调用函数求1 / 2 + 1 / 4 + ... + 1 / n, 当输入n为奇数时，调用函数1 / 1 + 1 / 3 + ... + 1 / n(指针函数

def even(num):
s = 0
for i in range(2, num+1, 2):
s += 1 / i
return s

def podd(num):
s = 0
for i in range(1, num+1, 2):
s += 1 / i
return s

def dcall(fp, n):
s = fp(n)
return s

if __name__ == "__main__":
num = int(input("请输入一个整数："))
if num % 2 == 0:
print("偶数")
sum = dcall(even,num)
else:
print("奇数")
sum = dcall(podd, num)
print(sum)