# Python – Unique values Multiplication

• Last Updated : 01 Mar, 2020

This article focuses on one of the operation of getting the unique list from a list that contains a possible duplicates and performing its product. This operations has large no. of applications and hence itâ€™s knowledge is good to have.

Method 1 : Naive method + loop
In naive method, we simply traverse the list and append the first occurrence of the element in new list and ignore all the other occurrences of that particular element. The task of product is performed using loop.

 `# Python 3 code to demonstrate ``# Unique values Multiplication``# using naive methods + loop`` ` `# getting Product ``def` `prod(val) : ``    ``res ``=` `1` `    ``for` `ele ``in` `val: ``        ``res ``*``=` `ele ``    ``return` `res  `` ` `# initializing list``test_list ``=` `[``1``, ``3``, ``5``, ``6``, ``3``, ``5``, ``6``, ``1``]``print` `(``"The original list is : "` `+` `str``(test_list))`` ` `# using naive method + loop``# Unique values Multiplication``# from list ``res ``=` `[]``for` `i ``in` `test_list:``    ``if` `i ``not` `in` `res:``        ``res.append(i)``res ``=` `prod(res)`` ` `# printing list after product``print` `(``"The unique elements product : "` `+` `str``(res))`

Output :

```The original list is : [1, 3, 5, 6, 3, 5, 6, 1]
The unique elements product : 90
```

Method 2 : Using set() + loop
This is the most popular way by which the duplicated are removed from the list. After that the product of list can be performed using loop.

 `# Python 3 code to demonstrate ``# Unique values Multiplication``# using set() + loop`` ` `# getting Product ``def` `prod(val) : ``    ``res ``=` `1` `    ``for` `ele ``in` `val: ``        ``res ``*``=` `ele ``    ``return` `res  `` ` `# initializing list``test_list ``=` `[``1``, ``5``, ``3``, ``6``, ``3``, ``5``, ``6``, ``1``]``print` `(``"The original list is : "` `+` `str``(test_list))`` ` `# Unique values Multiplication``# using set() + loop ``res ``=` `prod(``list``(``set``(test_list)))`` ` `# Unique values Multiplication``# using set() + loop``# printing result``print` `(``"The unique elements product : "` `+` `str``(res))`

Output :

```The original list is : [1, 3, 5, 6, 3, 5, 6, 1]
The unique elements product : 90
```

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