238 product of array except self

def productExceptSelf(self, nums):
        result = []
        multipy_forward,multipy_backward,product1,product2 = [],[],1,1
        for i,j in zip(range(len(nums)-1),range(len(nums)-1,0,-1)):
            product1,product2 = product1*nums[i],product2*nums[j]
            multipy_forward.append(product1)
            multipy_backward.append(product2)
        for i in range(len(nums)):
            if i == 0:
                product1,product2 = 1,multipy_backward[-1-i]
            elif i > 0 and i < len(nums)-1:
                product1,product2 = multipy_forward[i-1],multipy_backward[-1-i]
            else:
                product1,product2 = multipy_forward[-1],1
            result.append(product1*product2)
        return result
   
    #constant space complexity
    def productExceptSelf(self,nums):
        result,product = [],1
        for x in nums:
            result.append(product)
            product *= x
        product = 1
        for i in range(len(nums)-1,-1,-1):
            result[i] *= product
            product *= nums[i]
        return result