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Python: Rescale and shift numbers so that they cover the range [0, 1]

Python Programming Puzzles: Exercise-32 with Solution

Write a Python program to rescale and shift numbers of a given list, so that they cover the range [0, 1].

Input:
[18.5, 17.0, 18.0, 19.0, 18.0]
Output:
[0.75, 0.0, 0.5, 1.0, 0.5]

Input:
[13.0, 17.0, 17.0, 15.5, 2.94]
Output:
[0.7155049786628734, 1.0, 1.0, 0.8933143669985776, 0.0]

Pictorial Presentation:

Python: Rescale and shift numbers so that they cover the range [0, 1].

Sample Solution:

Python Code:

def test(nums):
    a = min(nums)
    b = max(nums)
    if b - a == 0:
        return [0.0] + [1.0] * (len(nums) - 1)
    for i in range(len(nums)):
        nums[i] = (nums[i] - a) / (b - a)
    return nums

nums = [18.5, 17.0, 18.0, 19.0, 18.0]
print("Original list:")
print(nums)
print("Rescale and shift the numbers of the said list so that they cover the range [0, 1]:")
print(test(nums))
nums = [13.0, 17.0, 17.0, 15.5, 2.94]
print("\nOriginal list:")
print(nums)
print("Rescale and shift the numbers of the said list so that they cover the range [0, 1]:")
print(test(nums))

Sample Output:

Original list:
[18.5, 17.0, 18.0, 19.0, 18.0]
Rescale and shift the numbers of the said list so that they cover the range [0, 1]:
[0.75, 0.0, 0.5, 1.0, 0.5]

Original list:
[13.0, 17.0, 17.0, 15.5, 2.94]
Rescale and shift the numbers of the said list so that they cover the range [0, 1]:
[0.7155049786628734, 1.0, 1.0, 0.8933143669985776, 0.0]

Flowchart:

Flowchart: Python - Rescale and shift numbers so that they cover the range [0, 1].

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