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:

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 Code Editor:

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