pythonHakrnk

https://www.hackerrank.com/profile/mourad_smail

A collection of Python practice solutions covering core Python concepts and NumPy operations, primarily based on HackerRank challenges.

Table of Contents

• Overview
• Prerequisites
• Repository Structure
  • String Manipulation
  • Lists, Tuples & Sets
  • NumPy Operations
  • Basic Python
• Running the Solutions
• Topics Covered

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Overview

This repository contains standalone Python scripts, each solving a specific programming challenge. The solutions are organized by topic and demonstrate common Python patterns and NumPy usage.

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Prerequisites

• Python 3.x
• NumPy (required for all NumPy-related scripts)

Install NumPy with:

pip install numpy

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Repository Structure

String Manipulation

File	Description
sWAPcASE.py	Swaps the case of every character in a string (uppercase ↔ lowercase).
StringFormatting.py	Prints numbers from 1 to N in decimal, octal, hexadecimal, and binary, right-justified.
StringSplitAndJoin.py	Splits a string on spaces and rejoins the tokens with hyphens.
StringValidators.py	Checks a string for alphanumeric, alphabetic, digit, lowercase, and uppercase characters.
FindAString.py	Counts how many times a substring appears within a string (case-sensitive).
Mutations.py	Replaces a character at a given index in a string.
TextAlignment.py	Draws an ASCII art "H" pattern using rjust, ljust, and center string methods.
TextWrap.py	Wraps a long string to a specified maximum width by inserting newlines.
WhatSYourName.py	Accepts a first and last name and prints a personalized greeting.
DesignerDoorMat.py	Generates a decorative door-mat pattern with a "WELCOME" centred message.

Lists, Tuples & Sets

File	Description
Lists.py	Processes a sequence of list commands (insert, append, remove, sort, pop, reverse, print).
Tuples.py	Creates a tuple from user input and prints its hash value.
IntroductiontoSets.py	Computes the average of the unique elements in an array by converting it to a set.
SymmetricDifference.py	Placeholder for a symmetric-difference set exercise.

NumPy Operations

File	Description
Arrays.py	Converts a space-separated string of numbers into a NumPy float array and reverses it.
ArrayMathematics.py	Demonstrates element-wise arithmetic on 2-D NumPy arrays (add, subtract, multiply, floor-divide, mod, power).
Concatenate.PY	Vertically stacks multiple NumPy arrays using numpy.vstack().
EyeandIdentity.py	Creates and displays identity matrices using numpy.eye().
FloorCeilandRint.py	Applies numpy.floor(), numpy.ceil(), and numpy.rint() to an array.
ShapeandReshape.py	Reads nine numbers and reshapes them into a 3 × 3 NumPy array.
TransposeandFlatten.py	Transposes a 2-D NumPy array and then flattens it to 1-D.
ZerosandOnes.py	Creates NumPy arrays filled with zeros and ones using numpy.zeros() and numpy.ones().

Basic Python

File	Description
PrintFunction.py	Prints integers 1 through N as a single concatenated string without spaces.

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Running the Solutions

Each script is self-contained and can be run directly from the command line:

python <filename>.py

Example:

python sWAPcASE.py

Many scripts read input interactively. Supply the required values when prompted, or pipe them from a file:

echo "Hello World" | python sWAPcASE.py

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Topics Covered

• Core Python

  • String methods (split, join, center, ljust, rjust, islower, isupper, isalpha, isdigit, isalnum)
  • List operations (insert, append, remove, sort, pop, reverse)
  • Tuples and hashing
  • Sets and set operations
  • String formatting (f-strings, format specifiers for octal, hex, binary)
  • Text wrapping and alignment

• NumPy

  • Array creation (numpy.array, numpy.zeros, numpy.ones, numpy.eye)
  • Array manipulation (numpy.flip, numpy.vstack, numpy.transpose, .flatten, .reshape)
  • Element-wise arithmetic (numpy.add, numpy.subtract, numpy.multiply, numpy.floor_divide, numpy.mod, numpy.power)
  • Rounding functions (numpy.floor, numpy.ceil, numpy.rint)