# Python | Bitwise OR among List elements

• Last Updated : 27 Aug, 2019

Sometimes, while programming, we have a problem in which we might need to perform certain bitwise operations among list elements. This is an essential utility as we come across bitwise operations many times. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using `reduce() + lambda + "|"` operator
The above functions can be combined to perform this task. We can employ reduce() to accumulate the result of OR logic specified by the lambda function. Works only with Python2.

 `# Python code to demonstrate working of``# Bitwise OR among List elements``# Using reduce() + lambda + "|" operator`` ` `# initializing list``test_list ``=` `[``7``, ``8``, ``9``, ``1``, ``10``, ``7``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# Bitwise OR among List elements``# Using reduce() + lambda + "|" operator``res ``=` `reduce``(``lambda` `x, y: x | y, test_list)`` ` `# printing result ``print``(``"The Bitwise OR of list elements are : "` `+` `str``(res))`

Output :

```The original list is : [7, 8, 9, 1, 10, 7]
The Bitwise OR of list elements are : 15
```

Method #2 : Using `reduce() + operator.ior`
This task can also be performed using this method. In this the task performed by lambda function in above method is performed using ior function for cumulative OR operation. Works with Python2 only.

 `# Python code to demonstrate working of``# Bitwise OR among List elements``# Using reduce() + operator.ior``from` `operator ``import` `ior`` ` `# initializing list``test_list ``=` `[``7``, ``8``, ``9``, ``1``, ``10``, ``7``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# Bitwise OR among List elements``# Using reduce() + operator.ior``res ``=` `reduce``(ior, test_list)`` ` `# printing result ``print``(``"The Bitwise OR of list elements are : "` `+` `str``(res))`

Output :

```The original list is : [7, 8, 9, 1, 10, 7]
The Bitwise OR of list elements are : 15
```

My Personal Notes arrow_drop_up