def productarr(nums):

left_prod = []

for i in range(0, len(nums)):

if i == 0:

left_prod.append(nums[i])

else:

left_prod.append(left_prod[i - 1] * nums[i])

right_prod = []

j = 0

for i in range(len(nums) - 1, -1, -1):

if i == len(nums) - 1:

right_prod.append(nums[i])

else:

right_prod.append(right_prod[j - 1] * nums[i])

j += 1

right_product=right_prod[::-1]

result = []

for i in range(0, len(nums)):

if i == 0:

result.append(1 * right_product[i + 1])

elif i == len(nums) - 1:

result.append(left_prod[i - 1] * 1)

else:

result.append(left_prod[i - 1] * right_product[i + 1])

return result

num=[1,2,3,4]

print(productarr(num))