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Python Challenges: Check a sequence of numbers is an arithmetic progression or not

Python Challenges - 1: Exercise-20 with Solution

Write a Python program to check a sequence of numbers is an arithmetic progression or not.

In mathematics, an arithmetic progression or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant.
For example, the sequence 5, 7, 9, 11, 13, 15 ... is an arithmetic progression with common difference of 2.

Explanation:

Python: Check a sequence of numbers is an arithmetic progression or not

Sample Solution:-

Python Code:

def is_arithmetic(l):
    delta = l[1] - l[0]
    for index in range(len(l) - 1):
        if not (l[index + 1] - l[index] == delta):
             return False
    return True

print(is_arithmetic([5, 7, 9, 11]))
print(is_arithmetic([5, 8, 9, 11]))

Sample Output: 

True  
False

Flowchart:

Python Flowchart: Check a sequence of numbers is an arithmetic progression or not

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Previous: Write a Python program to reverse the bits of an integer (32 bits unsigned).
Next: Write a Python program to check a sequence of numbers is a geometric progression or not.

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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