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Python | List Inversions

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  • Last Updated : 23 Jan, 2020
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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 map() + lambda + "~" operator
The above functions can be combined to perform this task. We can employ map() to accumulate the result of Inversion logic specified by the lambda function.




# Python3 code to demonstrate working of
# List Inversions
# Using map() + lambda + "~" operator
  
# initializing list
test_list = [7, 8, 9, 1, 10, 7]
  
# printing original list
print("The original list is : " + str(test_list))
  
# List Inversions
# Using map() + lambda + "~" operator
res = list(map(lambda x: ~x, test_list)) 
  
# printing result 
print("The Bitwise Inversions of list elements are : " + str(res))


Output :

The original list is : [7, 8, 9, 1, 10, 7]
The Bitwise Inversions of list elements are : [-8, -9, -10, -2, -11, -8]

 

Method #2 : Using map() + operator.invert
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 Inversion operation.




# Python 3 code to demonstrate working of
# List Inversions
# Using map() + operator.invert
from operator import invert
  
# initializing list
test_list = [7, 8, 9, 1, 10, 7]
  
# printing original list
print("The original list is : " + str(test_list))
  
# List Inversions
# Using map() + operator.invert
res = list(map(invert, test_list))
  
# printing result 
print("The Bitwise Inversions of list elements are : " + str(res))


Output :

The original list is : [7, 8, 9, 1, 10, 7]
The Bitwise Inversions of list elements are : [-8, -9, -10, -2, -11, -8]

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