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Python: Interleave multiple lists of different lengths using itertools module

Python Itertools: Exercise-38 with Solution

Write a Python program to interleave multiple given lists of different lengths using itertools module.

Sample Solution:

Python Code:

from itertools import chain, zip_longest
def interleave_diff_len_lists(list1, list2, list3, list4):
    return [x for x in chain(*zip_longest(list1, list2, list3, list4)) if x is not None]    
    
nums1 = [2, 4, 7, 0, 5, 8]
nums2 = [2, 5, 8]
nums3 = [0, 1]
nums4 = [3, 3, -1, 7]

print("\nOriginal lists:")
print(nums1)
print(nums2)
print(nums3)
print(nums4)

print("\nInterleave said lists of different lengths:")
print(interleave_diff_len_lists(nums1, nums2, nums3, nums4))

Sample Output:

Original lists:
[2, 4, 7, 0, 5, 8]
[2, 5, 8]
[0, 1]
[3, 3, -1, 7]

Interleave said lists of different lengths:
[2, 2, 0, 3, 4, 5, 1, 3, 7, 8, -1, 0, 7, 5, 8]

Python Code Editor:


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Next: Write a Python program to get the index of the first element, which is greater than a specified element 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