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Python: Find the indexes of numbers, below a given threshold

Python Programming Puzzles: Exercise-11 with Solution

Write a Python program to find the indexes of numbers of a given list below a given threshold.

Input:
[(100,(0, 12, 45, 3, 4923, 322, 105, 29, 15, 39, 55))]
Output:
[0, 1, 2, 3, 7, 8, 9, 10]

Input:
[(10,(0, 12, 4, 3, 49, 9, 1, 5, 3))]
Output:
[0, 2, 3, 5, 6, 7, 8]

Pictorial Presentation:

Python: Find the indexes of numbers, below a given threshold.

Sample Solution:

Python Code:

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

def test(nums, n):
    return [i for i,n in enumerate(nums) if n<thresh]

nums=[0, 12, 45, 3, 4923, 322, 105, 29, 15, 39, 55]
thresh = 100
print("Original list:")
print(nums)
print("Threshold: ",thresh)
print("Check the indexes of numbers of the said list below the given threshold:")
print(test(nums, thresh))
nums=[0, 12, 4, 3, 49, 9, 1, 5, 3]
thresh = 10
print("\nOriginal list:")
print(nums)
print("Threshold: ",thresh)
print("Check the indexes of numbers of the said list below the given threshold:")
print(test(nums, thresh))

Sample Output:

Original list:
[0, 12, 45, 3, 4923, 322, 105, 29, 15, 39, 55]
Threshold:  100
Check the indexes of numbers of the said list below the given threshold:
[0, 1, 2, 3, 7, 8, 9, 10]

Original list:
[0, 12, 4, 3, 49, 9, 1, 5, 3]
Threshold:  10
Check the indexes of numbers of the said list below the given threshold:
[0, 2, 3, 5, 6, 7, 8]

Flowchart:

Flowchart: Python - Find the indexes of numbers, below a given threshold.

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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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