## Eight Queens Puzzle in Python

Click me to play The Eight Queens Puzzle is a classic problem whose goal is to place 8 queens on an 8×8 chessboard in such a way that none of the queens share a row, column or diagonal. The version discussed here allows exploration of not just an 8×8 but an arbitrary size nxn board, […]

## Running Python Scripts from a Command Line

There are many ways to run Python code. Many learners begin with IDLE which comes bundled with the standard Python installation. You can go a long way with IDLE but eventually you will want to progress onto different environments. A very common setup for small Python projects is the use of a text editor such […]

## Exploring Random Walks with Python Turtle Graphics

In this post we will be looking at an idea from mathematics called a random walk. In a random walk, each step in a process is determined randomly and we are interested in the state of the process after a given number of steps. There are examples of this phenomenon happening all around us. For […]

## Generating Random Graphs in Python

Random Graphs in Python for A Level Computer Science and Beyond The jupyter notebook below shows an implementation of an algorithm for generating a random undirected, unweighted graph. The algorithm uses the Erdős–Rényi model, but you don’t need to know about that to understand how it works – the pseudo code makes is quite clear, […]

## Python Nested FOR Loops for Computer Science GCSE and A Level

Why do I Need Nested Loops? Nested loops are a very important concept in Python programming and Computer Science GCSE and A Level, and are used in many algorithms. For example sorting algorithms such as Bubble Sort and Selection Sort rely on them, as does iterating through a 2D list. Sometimes while loops are used […]

## Ultimate Guide to Free Python Resources for Beginners

Learning to program with Python is both fun and challenging. For some, it could mark the beginning of a life-long journey of discovery and creation. In many professions a knowledge of Python will give you a distinct advantage. We have covered some of the advantages of studying Computer Science in a previous article. Many of […]

## 2-Dimensional Arrays in Python for Computer Science GCSE and A Level

2-dimensional arrays are extremely important data structures in programming, and you need to understand them for Computer Science GCSE and A Level. They can be very confusing to begin with, and you should make sure you are confident and competent with 1-dimensional arrays before learning about them. For the purposes of GCSE and A-Level Computer […]

## Flowcharts for GCSE Computer Science

Representing algorithms for GCSE Computer Science There are several ways to represent algorithms for GCSE Computer Science: Structured English Flowchart Pseudocode Program statements in a particular language In this article we are looking at flowcharts for GCSE Computer Science. For our example, we will create an algorithm which determines whether a given whole number is […]

## Binary Search Algorithm for Computer Science GCSE and A Level

Binary search is an algorithm which is fundamental to both Computer Science GCSE and A Level for all boards. It is a very clever algorithm which reduces the time needed to search for items in large datasets dramatically. It is important to note that in order to use binary search, your data must be sorted. […]

## Node Class for a Linked List with Object Oriented Python

When you come to study Data Structures such as Stacks, Queues, Linked Lists and Binary Trees for A Level Computer Science, you will often make use of Object Oriented Programming. That is a bit of a double whammy if you are not yet very confident with OOP, and it can seem a bit overwhelming. I’ve […]