Python coding challenges for interviews

Given a set of four numbers representing a “circular array” we can test to see if the absolute values of the differences between each adjoining element will eventually coalesce into a single value.

Calculate and print the factorial of a given integer.

You and Fredrick are good friends. Yesterday, Fredrick received credit cards from ABCD Bank. He wants to verify whether his credit card numbers are valid or not. You happen to be great at regex so he is asking for your help to find a valid credit card

A group of schools has a specific number of lockers and a specific number of students. All lockers are closed on the first day of school. As students get to school they begin to play with the lockers. The first student opens every locker. The second student begins with the 2nd locker and closes every other locker. The third student starts with the third locker and changes every 3rd locker. That is, the third student opens the locker if it is closed and closes it if it is open. The 4th student starts with locker 4 and changes every 4th locker and so on. After all the students are done, display how many lockers are open.

Write a program to find out where Raj has to pass the ball or should he say "Over"

Lychrel number is a natural number that cannot form a palindrome through the iterative process of repeatedly reversing its digits and adding the resulting numbers.

An isogram is a logological term for a word or phrase without a repeating letter. It is also used by some people to mean a word or phrase in which each letter appears the same number of times, not necessarily just once.

A hailstone sequence is a calculation of numbers that increase and decrease but eventually settles into a repeating pattern of the numbers 4, 2, 1.

You need to identify the largest substring that occurs more than once within a larger string

Given 3 different integer numbers, determine if the difference between the smallest number and the middle number is the same as the difference between the middle number and the largest number.

Positive integers can be classified as abundant, deficient, or perfect. Abundant integers are those whose proper factors sum to a larger number.