w3resource logo


Python Exercises

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.

Input : [5, 7, 9, 11]
Output : True

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]))

Output :

True                                                                    
False

Flowchart:

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

Python Code Editor:

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]))

Improve this sample solution and post your code through Disqus



Join our Question Answer community to learn and share your programming knowledge.

Help the community:

Python: Fizzbuzz

C++: Decimal to binary conversion

JavaScript: Need Help in JavaScript

Python: Help me with this program