Python: Cartesian product of two or more given lists using itertools
Python Itertools: Exercise-12 with Solution
Write a Python program to create Cartesian product of two or more given lists using itertools.
In mathematics, specifically set theory, the Cartesian product of two sets A and B, denoted A × B, is the set of all ordered pairs (a, b) where a is in A and b is in B. In terms of set-builder notation, that is
A table can be created by taking the Cartesian product of a set of rows and a set of columns. If the Cartesian product rows × columns is taken, the cells of the table contain ordered pairs of the form (row value, column
Sample Solution:
Python Code:
import itertools
def cartesian_product(lists):
return list(itertools.product(*lists))
ls = [[1,2],[3,4]]
print("Original Lists:",ls)
print("Cartesian product of the said lists: ",cartesian_product(ls))
ls = [[1,2,3],[3,4,5]]
print("\nOriginal Lists:",ls)
print("Cartesian product of the said lists: ",cartesian_product(ls))
ls = [[],[1,2,3]]
print("\nOriginal Lists:",ls)
print("Cartesian product of the said lists: ",cartesian_product(ls))
ls = [[1,2],[]]
print("\nOriginal Lists:",ls)
print("Cartesian product of the said lists: ",cartesian_product(ls))
Sample Output:
Original Lists: [[1, 2], [3, 4]] Cartesian product of the said lists: [(1, 3), (1, 4), (2, 3), (2, 4)] Original Lists: [[1, 2, 3], [3, 4, 5]] Cartesian product of the said lists: [(1, 3), (1, 4), (1, 5), (2, 3), (2, 4), (2, 5), (3, 3), (3, 4), (3, 5)] Original Lists: [[], [1, 2, 3]] Cartesian product of the said lists: [] Original Lists: [[1, 2], []] Cartesian product of the said lists: []
Python Code Editor:
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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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