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Python: Start with a list of integers, keep every other element in place and otherwise sort the list

Python Programming Puzzles: Exercise-92 with Solution

Write a Python program to start with a list of integers, keep every other element in place and otherwise sort the list.

Input: 
[2, 5, 6, 3, 1, 4, 34]
Output:
[1, 5, 2, 3, 6, 4, 34]

Input:
[8, 0, 7, 2, 9, 4, 1, 2, 8, 3]
Output:
[1, 0, 7, 2, 8, 4, 8, 2, 9, 3]

Sample Solution:

Python Code:

#License: https://bit.ly/3oLErEI

def test(nums):
    li = nums.copy()    
    for i in range(len(li)):
        if i % 2 == 0: 
            for j in range(i+2, len(li), 2):
                if li[j] < li[i]:
                    swap(li, i, j)
    
    return li
def swap(li, i, j):
    temp = li[i]
    li[i] = li[j]
    li[j] = temp
nums = [2, 5, 6, 3, 1, 4, 34]
print("Original list (triple) of lists:")
print(nums)
print("In the said list, keep every other element in place and otherwise sort the list.:")
print(test(nums))
nums = [8, 0, 7, 2, 9, 4, 1, 2, 8, 3]
print("\nOriginal list (triple) of lists:")
print(nums)
print("In the said list, keep every other element in place and otherwise sort the list.:")
print(test(nums))

Sample Output:

Original list (triple) of lists:
[2, 5, 6, 3, 1, 4, 34]
In the said list, keep every other element in place and otherwise sort the list.:
[1, 5, 2, 3, 6, 4, 34]

Original list (triple) of lists:
[8, 0, 7, 2, 9, 4, 1, 2, 8, 3]
In the said list, keep every other element in place and otherwise sort the list.:
[1, 0, 7, 2, 8, 4, 8, 2, 9, 3]

Flowchart:

Flowchart: Python - Start with a list of integers, keep every other element in place and otherwise sort the list.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor :

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Previous: Find all n-digit integers that start or end with 2.
Next: Find the closest palindrome.

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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