Hackerrank-python

Python Certification Test Solutions

This repository contains solutions to coding challenges from the HackerRank Python certification test. These solutions demonstrate proficiency in Python programming and problem-solving.

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Challenges

1. Vending Machine

Create a VendingMachine class that simulates a simple vending machine. The machine holds a certain number of items, each with a fixed price.

• Users can buy items by specifying the number of items and inserting money.
• The machine should keep track of remaining items and return the correct change.
• If there are not enough items or insufficient money, appropriate errors or messages should be handled.

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2. String Transformation

Write a function that transforms each word in a sentence based on the alphabetical comparison of consecutive characters.

• For each word, the first character remains unchanged.
• For every other character:
  • If it is alphabetically greater than the previous character, convert it to uppercase.
  • If it is alphabetically smaller, convert it to lowercase.
  • If it is the same, leave it unchanged.
• Return the transformed sentence as a single string.

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