Python: Find common element[s] in a given nested lists
Last update on December 01 2020 16:54:30 [UTC/GMT +8 hours]Python | Find common elements in list of lists
The problem of finding the common elements in list of 2 lists is quite a common problem and can be dealt with ease and also has been discussed before many times. But sometimes, we require to find the elements that are in common from N lists. Let’s discuss certain ways in which this operation can be performed.
Method #1 : Using reduce[] + lambda + set[]
This particular task can be achieved in just a one line using the combination of the above functions. The reduce function can be used to operate the function of “&” operation to all the list. The set function can be used to convert list into a set to remove repetition.
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# Python3 code to demonstrate
# common element extraction form N lists
# using reduce[] + lambda + set[]
from functools import reduce
# initializing list of lists
test_list = [[2, 3, 5, 8], [2, 6, 7, 3], [10, 9, 2, 3]]
# printing original list
print ["The original list is : " + str[test_list]]
# common element extraction form N lists
# using reduce[] + lambda + set[]
res = list[reduce[lambda i, j: i & j, [set[x] for x in test_list]]]
# printing result
print ["The common elements from N lists : " + str[res]]
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Output:
The original list is : [[2, 3, 5, 8], [2, 6, 7, 3], [10, 9, 2, 3]]
The common elements from N lists : [2, 3]
Method #2 : Using map[] + intersection[]
The map function can be used to convert each of the lists to set to be operated by to perform the intersection, using the set.intersection function. This is the most elegant way to perform this particular task.
|
# Python3 code to demonstrate
# common element extraction form N lists
# using map[] + intersection[]
# initializing list of lists
test_list = [[2, 3, 5, 8], [2, 6, 7, 3], [10, 9, 2, 3]]
# printing original list
print ["The original list is : " + str[test_list]]
# common element extraction form N lists
# using map[] + intersection[]
res = list[set.intersection[*map[set, test_list]]]
# printing result
print ["The common elements from N lists : " + str[res]]
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Output:
The original list is : [[2, 3, 5, 8], [2, 6, 7, 3], [10, 9, 2, 3]]
The common elements from N lists : [2, 3]
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Find common elements in list of lists in Python
PythonServer Side ProgrammingProgramming
It is possible to have a list whose inner elements are also lists. In such cases we may come across a need when we have to find out the common elements among these inner lists. In this article we will find out the approaches to achieve this.
Find the common elements in two lists in Python
By Shriprakash Tiwari
In this tutorial, We are going to learn how to find the common elements in two lists in Python.
To find the common list from two lists, we have to store the common elements in the third variable. There are various methods to find and store the common elements from two lists.
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In this tutorial, we'll learn everything about Python lists: creating lists, changing list elements, removing elements, and other list operations with the help of examples.