# Python – Index match element Product

Sometimes, while working with Python list we can have a problem in which we have to compare two lists for index similarity and hence can have a task of mutiplication equal index pairs. Let’s discuss certain way in which this task can be performed.

Method #1 : Using loop + `zip()`
This task can be performed by passing the zip(), which performs task of mapping both list with each other, to the function which computes the product according to equal indices.

 `# Python3 code to demonstrate working of ` `# Index match element Product ` `# using loop + zip() ` ` `  `def` `prod(val) :      ` `    ``res ``=` `1`          `    ``for` `ele ``in` `list``(val):          ` `        ``res ``*``=` `ele          ` `    ``return` `res ` ` `  `# initialize lists ` `test_list1 ``=` `[``5``, ``6``, ``10``, ``4``, ``7``, ``1``, ``19``] ` `test_list2 ``=` `[``6``, ``6``, ``10``, ``3``, ``7``, ``10``, ``19``] ` ` `  `# printing original lists ` `print``(``"The original list 1 is : "` `+` `str``(test_list1)) ` `print``(``"The original list 2 is : "` `+` `str``(test_list2)) ` ` `  `# Index match element Product ` `# using loop + zip() ` `res ``=` `prod(x ``for` `x, y ``in` `zip``(test_list1, test_list2) ``if` `x ``=``=` `y) ` ` `  `# printing result ` `print``(``"Multiplication of Identical elements : "` `+` `str``(res)) `

Output :

```The original list 1 is : [5, 6, 10, 4, 7, 1, 19]
The original list 2 is : [6, 6, 10, 3, 7, 10, 19]
Multiplication of Identical elements : 7980
```

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