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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

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