--- title: "Coding Classes in Gloucestershire | Live Online, Ages 6 to 67" description: "Live online coding, Python, cyber security and maths classes across Gloucestershire, from Gloucester and Cheltenham to Yate, Stroud, Cirencester and Tewkesbury." canonical: https://learn.modernagecoders.com/coding-classes-in-gloucestershire source: src/pages/coding-classes-in-gloucestershire.html --- > Live online coding, Python, cyber security and maths classes across Gloucestershire, from Gloucester and Cheltenham to Yate, Stroud, Cirencester and Tewkesbury. Skip to contentCourses for Gloucestershire ## Gloucestershire learners often begin here A seven-year-old in Tetbury who loves dice games, a Year 7 in Lydney writing a first Python program, a Year 10 in Cheltenham fascinated by codes, and a developer in Bradley Stoke who wants a deeper grip on algorithms. Each begins with a free lesson. [![Scratch Coding for Kids course thumbnail](/images/scratch-kids.webp)Ages 6 to 10Scratch Coding for KidsScratch games with dice and random events, where children first meet a computer "picking" a number.See the syllabus](/courses/scratch-programming-complete-course)[![Python and AI for Kids course thumbnail](/images/python-kids.webp)Ages 10 to 13Python and AI for KidsReal Python for children, with the random module used and then questioned: where do those numbers come from?See the syllabus](/courses/python-ai-kids-masterclass)[![Cybersecurity for Teens course thumbnail](/images/cybersecurity-teens.webp)Ages 13 to 18Cybersecurity for TeensDefensive, ethical security, from paper ciphers to the HTTPS padlock, with instructor-built puzzles.See the syllabus](/courses/cybersecurity-course-for-teens-ethical-defensive)[![Data Structures & Algorithms Course course thumbnail](/images/dsa-college.webp)AdultsData Structures & Algorithms CourseArrays to graphs to dynamic programming for adults, including cycle detection and the reasoning behind it.See the syllabus](/courses/data-structures-algorithms-masterclass-college) Browse the [course atlas](/course-atlas) for more than one hundred options and use the [coding roadmap](/coding-roadmap) to check prerequisites. The four we are known for ### Python, AI, vibe coding and agentic coding These run underneath everything above. Every one is live and online, placed by ability rather than by age, and the first class is free. [![Vibe Coding for Teens course thumbnail](/images/vibe-coding-teens.webp)Vibe codingAges 13 to 17Vibe Coding for TeensPython, web and AI projects where the learner still owns the thinking.See the syllabus](/courses/vibe-coding-for-teens-python-web-ai-projects-course)[![Python Automation Course course thumbnail](/images/python-college.webp)Python and AICollege and adultPython Automation CourseAutomate the work you already do, then let AI carry part of it.See the syllabus](/courses/python-ai-automation-masterclass-college)[![AI and Machine Learning for Teens course thumbnail](/images/ai-ml-teens.webp)AI and MLAges 14 to 18AI and Machine Learning for TeensTrain a model, read what it learned, and be able to say why it is wrong.See the syllabus](/courses/ai-ml-masterclass-teens)[![Codex & Claude Code course thumbnail](/images/codex-claude-code-adults.webp)Agentic codingProfessionalsCodex & Claude CodeRun AI coding agents on real work without losing control of the codebase.See the syllabus](/courses/codex-and-claude-code-ai-coding-agents-masterclass-for-adults-professionals)Gloucestershire in figures ## Seven councils, 935,500 people, from the Forest to the Cotswolds Each council's 2021 Census total is from Nomis. Towns are the ONS built-up areas, and we counted census output areas ourselves to see which towns reach over the county line. | Council | Usual residents | Main towns | | --- | --- | --- | | South Gloucestershire | 290,424 | Yate, Bradley Stoke, Patchway, Thornbury, Filton, Kingswood | | Gloucester | 132,416 | Gloucester | | Stroud | 121,104 | Stroud, Stonehouse, Dursley, Cam, Nailsworth | | Cheltenham | 118,836 | Cheltenham | | Tewkesbury | 94,884 | Bishop's Cleeve, Tewkesbury, Churchdown | | Cotswold | 90,832 | Cirencester, Tetbury, Moreton-in-Marsh | | Forest of Dean | 87,004 | Lydney, Cinderford, Newent, Coleford | South Gloucestershire, which has its own unitary council, holds almost a third of the county's people, most of them on the northern edge of Bristol. The Gloucestershire County Council area is a different place: two large towns, Gloucester and Cheltenham, whose built-up areas each spill into Tewkesbury district, and then valleys and wolds of small towns. A teenager in Cinderford and one in Moreton-in-Marsh live in the same county and a very long way apart. | Town | Residents | Town | Residents | | --- | --- | --- | --- | | Kingswood and Fishponds | 160,270 | Brockworth | 12,005 | | Gloucester | 118,555 | Filton | 10,960 | | Cheltenham | 115,940 | Lydney | 9,660 | | Yate | 28,350 | Cinderford | 8,775 | | Stroud | 26,080 | Stonehouse | 8,300 | | Bradley Stoke | 25,200 | Chipping Sodbury | 8,025 | | Quedgeley and Hardwicke | 21,125 | Dursley | 7,935 | | Cirencester | 17,715 | Cam | 7,730 | | Patchway | 16,520 | Chalford | 6,660 | | Bishop's Cleeve | 16,325 | Tetbury | 6,455 | | Frampton Cotterell and Winterbourne | 14,970 | Nailsworth | 5,660 | | Thornbury | 14,485 | Newent | 5,360 | | Tewkesbury | 14,390 | Coleford | 5,020 | | Churchdown | 13,480 | Moreton-in-Marsh | 5,010 | | Stoke Gifford | 13,470 | | | Every row agrees with our own output-area count to within rounding except the first. Kingswood and Fishponds is a built-up area of 160,270 that crosses from South Gloucestershire into the city of Bristol; about 114,700 of its residents are on the Gloucestershire side, and the table prints the ONS total for the whole place. Bristol itself, of which only a sliver reaches into South Gloucestershire, is left out. School calendars are set by the two councils and by academies; we did not read them, and the county's selective schools have [a separate maths page](/11-plus-maths-tuition-gloucestershire). The Gloucestershire project ## A random number generator, and three numbers that break it The simplest pseudo-random formula, three tests of how random it really is, and an attack a fifteen-year-old can carry out. A linear congruential generator is one line of code: take the last number, multiply it by a constant a, add another constant c, and keep the remainder after dividing by 65,536. The output jumps around convincingly. The learner starts with a = 25,173 and c = 13,849, which we picked, and runs three tests. The first asks how long before the numbers repeat. For that they use Floyd's method, a tortoise that moves one step and a hare that moves two, which finds the loop without storing a single earlier number. | Constants | Numbers before repeating | Verdict | | --- | --- | --- | | a = 25,173, c = 13,849 | 65,536, every possible value | The longest cycle possible at this size | | a = 25,173, c = 13,848 (even) | 16,384 | A quarter of the values never appear | | a = 25,172 (even multiplier) | Falls into a loop of length 1 | Useless: it gets stuck on one number | | a = 4, c = 1 | Falls into a loop of length 1 | Useless for the same reason | The second test looks at single bits. With the good constants, the lowest bit of the output goes 1, 0, 1, 0, 1, 0 for all twenty numbers we printed, and the next bit repeats every four. The numbers look random as a whole, but their last binary digit is as predictable as a ticking clock. Anyone who used that bit to decide a coin toss would lose every time to someone who knew. The third test is the attack. Suppose you know the formula's shape and the 65,536, but not a or c. Watch three outputs in a row. The difference between the second and third must be a times the difference between the first and second, which pins down a; then c follows. In our run, exactly one pair of constants fits three observed numbers, and it predicts the next 17 outputs, 17 out of 17. A generator like this is fine for a dice game. For a password or a key, it is a disaster. ### Ages 10 to 13 Write the one-line generator in Python, print its first twenty numbers, and write out each in binary to spot the last-digit pattern. ### Ages 13 to 16 Implement Floyd's tortoise and hare, find the period for several choices of a and c, and explain which choices fail. ### Ages 16 and up Recover a and c from three outputs by modular arithmetic, predict the rest, and read why real cryptography uses different generators. ### What this is and is not This is a teaching generator with constants we chose, attacked in a way described in any cryptography textbook. It is not how GCHQ or any modern system generates keys, and nothing here is a technique for attacking real systems. The GCHQ facts come from GCHQ's own pages. Why Cheltenham ## The Doughnut, and the county's place in the history of codes The Gloucestershire link, in GCHQ's own words. | Topic | What GCHQ says | | --- | --- | | Arriving | GCHQ first came to Cheltenham in the 1950s; the site in Oakley opened in 1952. | | The Doughnut | Its Cheltenham headquarters, known affectionately as the Doughnut, has been home since the move there in 2003. | | Opening | The HQ was officially opened by HM Queen Elizabeth II in 2004. | | The archive | The GCHQ archive contains around 16 million historical artefacts. | | Public key cryptography | James Ellis, who joined in 1952, conceived "non-secret encryption"; Malcolm Williamson devised a method of public key exchange. | GCHQ's account of its own history makes the point this project teaches: the ideas that protect every online payment today came from mathematicians asking whether something that looked impossible could be done, and checking carefully whether something that looked safe really was. A predictable generator is exactly the kind of thing that looks safe until someone checks. Modern Age Coders has no connection with GCHQ or with any Gloucestershire council, and nothing on this page suggests one. The facts are GCHQ's own; the generator, the attack and any errors are ours. Nearby pages [Gloucester](/best-coding-class-in-gloucester) has its own page, [Oxfordshire](/coding-classes-in-oxfordshire) and [Warwickshire](/coding-classes-in-warwickshire) lie to the east, and the [UK hub](/coding-classes-in-united-kingdom) lists the rest. Stages ## From rolling dice on screen to breaking a weak generator The free lesson places each learner. Age suggests a level; ability decides it. Ages 6 to 10 ### Chance in games Scratch games with random events, where children see a computer pick numbers and start to wonder how. [Scratch Coding for Kids](/courses/scratch-programming-complete-course)[Coding for Kids](/courses/kids-coding-blocks-masterclass)Ages 10 to 13 ### Numbers and binary Python with remainders, binary and simple formulas, the pieces a random generator is built from. [Python and AI for Kids](/courses/python-ai-kids-masterclass)[Maths Through Coding](/courses/maths-through-coding)Ages 13 to 18 ### Security thinking Ethical cyber security and algorithms, with the habit of asking how a system could be predicted or broken. [Cybersecurity for Teens](/courses/cybersecurity-course-for-teens-ethical-defensive)[Competitive Programming for Teens](/courses/competitive-programming-for-teens-course)Ages 18 to 67 ### Algorithms that hold up Data structures and algorithms for adults, including cycle detection, number theory and the limits of shortcuts. [Data Structures & Algorithms Course](/courses/data-structures-algorithms-masterclass-college)[Python Masterclass](/courses/python-programming-masterclass-zero-to-advanced-college)AI and randomness ## Ask an AI for a random password generator. Will it use a random source that cannot be predicted? Not always, and the code works either way until someone attacks it. Generated code often reaches for the most familiar random function in a language, which is usually designed for games and simulations, not for secrets. The resulting password generator runs perfectly and produces strings that look random, and nothing in a quick test reveals whether the next one can be predicted. The difference only matters when an attacker is watching, which is exactly when it matters most. A Gloucestershire student who has predicted seventeen numbers from three knows to ask where randomness comes from, whether it is meant for security, and what an attacker could learn from a few outputs. Those questions are how security reviewers read any code, and they are the questions a hurried prompt leaves out. So a Gloucestershire teenager should learn to code in 2026, in the county of the Doughnut, to be able to tell random-looking from unpredictable. The longer argument is in [why teenagers should still learn to code in 2026](/blog/is-coding-worth-learning-2026). How lessons work ## Coleford to Chipping Sodbury, from your own desk Gloucestershire's valleys and wolds make travel slow. Online lessons skip it entirely. ### At home, live A bedroom in Newent, a kitchen in Nailsworth, a desk in Thornbury. The teacher shares a screen and the learner codes. ### School terms we use Year groups, GCSE options and A levels are named just as Gloucestershire schools name them, in English. ### The first lesson is free A real lesson with real work and an honest recommendation. You will not be asked to pay anything. ### Grouped by skill Between five and ten classmates who are at your stage, from different towns and countries, so nobody waits and nobody is lost. ### Term-time rhythm Most learners take two sessions a week and stop for the same holidays their school takes. ### Clock times made simple We run on Indian Standard Time at our end, yet every lesson slot we send a Gloucestershire family is written only in UK time, summer or winter. Why groups are formed by level Twenty-nine towns spread over valleys, wolds and suburbs rarely give any one place enough learners at the same stage. Level-based groups let a Stroud learner and a Yate learner share a class. Fees ## Gloucestershire fees One set of fees across the county, and for every country other than India. First class**USD 0** A complete lesson of real work, with a recommended level and course. Group tuition**USD 100** About eight lessons a month, five to ten learners at one level. Private tuition**USD 150** About eight lessons a month with a teacher and one learner. Families outside India are billed in US dollars, with no pound list. Payment begins only after the free lesson has agreed a course and a weekly time, and the pricing page covers pauses, missed lessons and switching between group and private. Request placement[Check availability](https://wa.me/919123366161?text=Hello%20Modern%20Age%20Coders%2C%20please%20could%20we%20book%20a%20free%20lesson%20for%20a%20learner%20in%20Gloucestershire%3F)Reviews ## Six Google reviews from our families Rated 4.9 across 547 Google reviews. These are real reviews, reproduced as written. ★★★★★ "The one step solution for my son. Modern Age Coders make learning coding so simple that kids love it. The teachers explain complex concepts clearly with practical exercises and interactive content." Ria Mukherjee Parent ★★★★★ "Modern Age Coders has been a game-changer for me. I struggled to grasp IT concepts and coding before joining, but their classes transformed everything. I can now confidently write complex programs with ease." Samriddha Mondal Student ★★★★★ "One of the most wonderful education centres out there. Education is not limited to school syllabus but focuses on skill development." Vansh Agarwal Student ★★★★★ "My child Dhairya is really enjoying the Modern Age Coders classes. This is his first online class and he eagerly looks forward to it. I can already see his improvement, and the teachers are very cooperative." Sonam Oswal Parent of Dhairya ★★★★★ "Modern Age Coders have wonderful teachers who teach in a clear, easy and practical way. The teacher boosts students' confidence and inspires them to learn without hesitation." Sonu Goyal Parent ★★★★★ "I highly recommend this computer coding class! The teachers are incredibly knowledgeable and passionate about coding." Ritu Kedia Parent Free placement class ## Request a free lesson An age or school year and one interest will do. The first lesson might be a Scratch dice game, a first Python program, or the generator and its three-number attack on this page. ### Contact the team directly WhatsApp or call [+91 91233 66161](tel:+919123366161), or email [contact@modernagecoders.com](mailto:contact@modernagecoders.com). This is Modern Age Coders' actual contact, an Indian number, and not an invented Gloucestershire one. [WhatsApp Modern Age Coders](https://wa.me/919123366161?text=Hello%20Modern%20Age%20Coders%2C%20please%20could%20we%20book%20a%20free%20lesson%20for%20a%20learner%20in%20Gloucestershire%3F) Submitted details are used for placement and follow-up. FAQ ## Gloucestershire questions The county, the random numbers project and our lessons. ### How many people live in Gloucestershire? The six Gloucestershire districts and South Gloucestershire held 935,500 usual residents at the 2021 Census, from ONS data on Nomis. South Gloucestershire was the largest council at 290,424. ### What are the largest towns in Gloucestershire? By ONS built-up area: Kingswood and Fishponds 160,270 (partly in Bristol), Gloucester 118,555, Cheltenham 115,940, Yate 28,350 and Stroud 26,080. The page lists twenty-nine above five thousand. ### What is the random numbers project? Learners build a linear congruential generator, find how soon it repeats with Floyd's method, spot the pattern in its lowest bit, and show that three outputs are enough to predict the next 17 out of 17. ### Why does predictability matter? Keys and passwords are only safe if nobody can guess them. A generator whose next output can be worked out from a few earlier ones gives an attacker that guess. ### When did GCHQ come to Cheltenham? GCHQ says it first came to Cheltenham in the 1950s, with the Oakley site opening in 1952, and moved into its headquarters, known as the Doughnut, in 2003. ### Is there a classroom in Gloucester or Cheltenham? No building exists; every session runs over live video, which lets a Cirencester learner and a Lydney learner study side by side from home. ### What ages do you teach? Six to sixty-seven. Scratch for young children, typed Python from about ten, cyber security and algorithms for teenagers, and algorithms or Python for adults. The free lesson sets the level. ### Do you teach cyber security to teenagers? Yes, as a defensive and ethical course for ages 13 to 18, from paper ciphers to the HTTPS padlock, with instructor-built puzzles. ### What does it cost? The first lesson costs nothing. Stay on and you pay USD 100 monthly for a group seat, or USD 150 monthly for one-to-one lessons; there is no joining charge and no contract length. ### When are Gloucestershire school holidays? Gloucestershire County Council, South Gloucestershire and academies set their own dates. We arrange lesson breaks around your school's calendar. More UK pages ## Around Gloucestershire The [Gloucester](/best-coding-class-in-gloucester) page covers the city. Neighbouring county pages include [Oxfordshire](/coding-classes-in-oxfordshire) and [Warwickshire](/coding-classes-in-warwickshire), and the [UK hub](/coding-classes-in-united-kingdom) has the full list. Book the free class[Message us on WhatsApp](https://wa.me/919123366161?text=Hello%20Modern%20Age%20Coders%2C%20please%20could%20we%20book%20a%20free%20lesson%20for%20a%20learner%20in%20Gloucestershire%3F)Free Gloucestershire class[Call +91 91233 66161](tel:+919123366161) ## Keep exploring Modern Age Coders ### Coding classes in nearby places - [Coding Classes in Goa](/coding-classes-in-goa) - [Coding Classes in Glanmire, Cork](/coding-classes-in-glanmire-cork) - [Coding & Maths Classes at Godrej Prakriti, Sodepur](/coding-classes-in-godrej-prakriti) - [Coding Classes in Gestel, Eindhoven](/coding-classes-in-gestel) - [Coding Classes in Gouda](/coding-classes-in-gouda) - [Coding & Maths Classes in Joka](/coding-classes-in-genexx-valley-joka) - [Coding Classes in Jharkhand](/coding-classes-in-jharkhand) - [Coding Classes in Jalan Bani Bu Hassan](/coding-classes-in-jalan-bani-bu-hassan) - [Coding Classes in Jalan Bani Bu Ali](/coding-classes-in-jalan-bani-bu-ali) - [Coding Classes in Argyll and Bute](/coding-classes-in-argyll-and-bute) ### Free resources - [Java Tutorial for Beginners to Advanced](/resources/java) - [Your First Java Program](/resources/java/your-first-java-program) - [Conditional Statements in Java (if, else, switch)](/resources/java/conditional-statements) - [GROUP BY and HAVING](/resources/sql/group-by-and-having) ### From the blog - [What is Vibe Coding? The Ultimate Deep-Dive Guide to AI-Powered](/blog/what-is-vibe-coding-future-of-software-development) - [Python List Comprehension: 15 Examples, Simple to Advanced](/blog/python-list-comprehension-explained) - [How to Help With Maths Homework (Without Solving It)](/blog/help-child-with-maths-homework) ### Start here - [Browse every live course at Modern Age Coders](/courses) - [Try a free trial class with a Modern Age Coders mentor](/free-trial) --- *Canonical: https://learn.modernagecoders.com/coding-classes-in-gloucestershire*