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Python: Common elements in a given list of lists

Python List: Exercise - 177 with Solution

Write a Python program to find common elements in a given list of lists.

Sample Solution:

Python Code:

def common_list_of_lists(lst):
    temp = set(lst[0]).intersection(*lst)
    return list(temp) 

nums = [[7,2,3,4,7],[9,2,3,2,5],[8,2,3,4,4]]
print("Original list:")
print(nums)
print("\nCommon elements of the said list of lists:")
print(common_list_of_lists(nums))
chars = [['a','b','c'],['b','c','d'],['c','d','e']]
print("\nOriginal list:")
print(chars)
print("\nCommon elements of the said list of lists:")
print(common_list_of_lists(chars))

Sample Output:

Original list:
[[7, 2, 3, 4, 7], [9, 2, 3, 2, 5], [8, 2, 3, 4, 4]]

Common elements of the said list of lists:
[2, 3]

Original list:
[['a', 'b', 'c'], ['b', 'c', 'd'], ['c', 'd', 'e']]

Common elements of the said list of lists:
['c']

Pictorial Presentation:

Python List: Common elements in a given list of lists.

Flowchart:

Flowchart: Common elements in a given list of lists.

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Python Code Editor:

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Previous: Write a Python program to create a new list dividing two given lists of numbers.
Next: Write a Python program to insert a specified element in a given list after every nth element.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m