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']
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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
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