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Python | Sliced Product in List
• Last Updated : 29 Dec, 2019

Accessing elements in a list has many types and variations. These are an essential part of Python programming and one must know to perform the same. This article discusses ways to fetch the initial K elements and do its multiplication. Let’s discuss a certain solution to perform this task.

Method #1 : Using list slicing + loop
This problem can be performed in 1 line rather than using a loop using the list slicing functionality provided by Python and then using a loop to perform the product.

 `# Python3 code to demonstrate ``# Sliced Product in List``# using list slicing + loop`` ` `# getting Product``def` `prod(val) :``    ``res ``=` `1` `    ``for` `ele ``in` `val:``        ``res ``*``=` `ele``    ``return` `res `` ` `# initializing list ``test_list ``=` `[``4``, ``5``, ``2``, ``6``, ``7``, ``8``, ``10``] `` ` `# printing original list ``print``(``"The original list : "` `+` `str``(test_list)) `` ` `# initializing K ``K ``=` `5`` ` `# Sliced Product in List``# using list slicing + loop``res ``=` `prod(test_list[:K])`` ` `# print result ``print``(``"The first K elements product of list is : "` `+` `str``(res)) `
Output :
```The original list : [4, 5, 2, 6, 7, 8, 10]
The first K elements product of list is : 1680
```

Method #2 : Using `islice()` + loop
The inbuilt funtions can also be used to perform this particular task. The islice function can be used to get the sliced list and then prod() can be employed to perform product.

 `# Python3 code to demonstrate ``# Sliced Product in List``# using islice() + loop``from` `itertools ``import` `islice `` ` `# getting Product``def` `prod(val) :``    ``res ``=` `1` `    ``for` `ele ``in` `val:``        ``res ``*``=` `ele``    ``return` `res `` ` `# initializing list ``test_list ``=` `[``4``, ``5``, ``2``, ``6``, ``7``, ``8``, ``10``] `` ` `# printing original list ``print``(``"The original list : "` `+` `str``(test_list)) `` ` `# initializing K ``K ``=` `5`` ` `# Sliced Product in List``# using islice() + loop``res ``=` `list``(islice(test_list, ``0``, K)) ``res ``=` `prod(res)`` ` `# print result ``print``(``"The first K elements product of list is : "` `+` `str``(res)) `
Output :
```The original list : [4, 5, 2, 6, 7, 8, 10]
The first K elements product of list is : 1680
```

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