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Python: Find the difference between elements (n+1th – nth) of a given list of numeric values

Python List: Exercise - 118 with Solution

Write a Python program to find the difference between elements (n+1th – nth) of a given list of numeric values.

Sample Solution:

Python Code:

def elements_difference(nums):
    result = [j-i for i, j in zip(nums[:-1], nums[1:])]
    return result

nums1 = [1,2,3,4,5,6,7,8,9,10]
nums2 = [2,4,6,8]

print("Original list:")
print(nums1)
print("\nDfference between elements (n+1th – nth) of the said list :")
print(elements_difference(nums1))
print("\nOriginal list:")
print(nums2)
print("\nDfference between elements (n+1th – nth) of the said list :")
print(elements_difference(nums2))


Sample Output:

Original list:
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Dfference between elements (n+1th – nth) of the said list :
[1, 1, 1, 1, 1, 1, 1, 1, 1]

Original list:
[2, 4, 6, 8]

Dfference between elements (n+1th – nth) of the said list :
[2, 2, 2]

Pictorial Presentation:

Python List: Find the difference between elements (n+1th – nth) of a given list of numeric values.

Flowchart:

Flowchart: Find the difference between elements (n+1th – nth) of a given list of numeric values.

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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