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Python: All possible combinations of the elements of a given list, use itertools module

Python Itertools: Exercise-35 with Solution

Write a Python program to get all possible combinations of the elements of a given list using itertools module.

Sample Solution:

Python Code:

import itertools
def combinations_list(list1):
    temp = []
    for i in range(0,len(list1)+1):
        temp.append(list(itertools.combinations(list1,i)))
    return temp

colors = ['orange', 'red', 'green', 'blue']
print("Original list:")
print(colors)
print("\nAll possible combinations of the said list’s elements:")
print(combinations_list(colors))

Sample Output:

Original list:
['orange', 'red', 'green', 'blue']

All possible combinations of the said list’s elements:
[[()], [('orange',), ('red',), ('green',), ('blue',)], [('orange', 'red'), ('orange', 'green'), ('orange', 'blue'), ('red', 'green'), ('red', 'blue'), ('green', 'blue')], [('orange', 'red', 'green'), ('orange', 'red', 'blue'), ('orange', 'green', 'blue'), ('red', 'green', 'blue')], [('orange', 'red', 'green', 'blue')]]

Python Code Editor:


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Previous: Write a Python program to compute the sum of digits of each number of a given list of positive integers.

Next: Write a Python program to add two given lists of different lengths, start from right , using itertools module.

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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