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Python: Find the indices of two entries that show that the list is not in increasing order

Python Programming Puzzles: Exercise-48 with Solution

Write a Python program to find the indices of two entries that show that the list is not in increasing order. If there are no violations (they are increasing), return an empty list.

Input:
[1, 2, 3, 0, 4, 5, 6]
Output:
[2, 3]

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

Input:
[1, 2, 3, 4, 6, 5, 7]
Output:
[4, 5]

Input:
[-3, -2, -3, 0, 2, 3, 4]
Output:
[1, 2]

Pictorial Presentation:

Python: Find the indices of two entries that show that the list is not in increasing order.
Python: Find the indices of two entries that show that the list is not in increasing order.

Sample Solution:

Python Code:

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

def test(nums):
    for i in range(len(nums) - 1):
        if nums[i] >= nums[i + 1]:
            return [i, i + 1]
    return []

nums =  [1,2,3,0,4,5,6]
print("Original list:")
print(nums)
print("Indices of two entries that show that the list is not in increasing order:")
print(test(nums))
nums =  [1,2,3,4,5,6]
print("\nOriginal list:")
print(nums)
print("Indices of two entries that show that the list is not in increasing order:")
print(test(nums))
nums =  [1,2,3,4,6,5,7]
print("\nOriginal list:")
print(nums)
print("Indices of two entries that show that the list is not in increasing order:")
print(test(nums))
nums =  [-3,-2,-3,0,2,3,4]
print("\nOriginal list:")
print(nums)
print("Indices of two entries that show that the list is not in increasing order:")
print(test(nums))

Sample Output:

Original list:
[1, 2, 3, 0, 4, 5, 6]
Indices of two entries that show that the list is not in increasing order:
[2, 3]

Original list:
[1, 2, 3, 4, 5, 6]
Indices of two entries that show that the list is not in increasing order:
[]

Original list:
[1, 2, 3, 4, 6, 5, 7]
Indices of two entries that show that the list is not in increasing order:
[4, 5]

Original list:
[-3, -2, -3, 0, 2, 3, 4]
Indices of two entries that show that the list is not in increasing order:
[1, 2]

Flowchart:

Flowchart: Python - Filter for the numbers in a list whose sum of digits is >0, where the first digit can be negative.

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: Filter for the numbers in a list whose sum of digits is >0, where the first digit can be negative.
Next: Find the h-index, the largest positive number h such that h occurs in the sequence at least h times.

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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