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Python: Interleave multiple lists of the same length. Use itertools module

Python Itertools: Exercise-29 with Solution

Write a Python program to interleave multiple lists of the same length. Use itertools module.

Sample Solution:

Python Code:

import itertools

def interleave_multiple_lists(list1,list2,list3):
    result = list(itertools.chain(*zip(list1, list2, list3)))
    return result
     
list1 = [100,200,300,400,500,600,700]
list2 = [10,20,30,40,50,60,70]
list3 = [1,2,3,4,5,6,7]
print("Original list:")
print("list1:",list1)
print("list2:",list2)
print("list3:",list3)
print("\nInterleave multiple lists:")
print(interleave_multiple_lists(list1,list2,list3))

Sample Output:

Original list:
list1: [100, 200, 300, 400, 500, 600, 700]
list2: [10, 20, 30, 40, 50, 60, 70]
list3: [1, 2, 3, 4, 5, 6, 7]

Interleave multiple lists:
[100, 10, 1, 200, 20, 2, 300, 30, 3, 400, 40, 4, 500, 50, 5, 600, 60, 6, 700, 70, 7]

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