--- title: "Online Coding and Python Classes in Mosman, Sydney" description: "Live online coding and Python classes for Mosman children, teenagers and adults, from first Scratch projects to real data work, in small groups or one to one." canonical: https://learn.modernagecoders.com/online-coding-and-python-classes-in-mosman-sydney source: src/pages/online-coding-and-python-classes-in-mosman-sydney.html --- > Live online coding and Python classes for Mosman children, teenagers and adults, from first Scratch projects to real data work, in small groups or one to one. Skip to contentCourse picks for Mosman ## Courses that make ranges second nature Each course here builds the habits behind the age-band project. The free trial sets the level, and nothing is paid until a course and time are agreed. [![Python for Teens course thumbnail](/images/python-teens.webp)Ages 13 to 17Python for TeensRanges, loops, conditions and functions, practised on small public tables like the Mosman age bands.See the syllabus](/courses/python-complete-masterclass-teens)[![Maths Through Coding course thumbnail](/images/maths-through-coding.webp)Ages 10 to 15Maths Through CodingIntervals, inequalities and counting explained by writing short programs.See the syllabus](/courses/maths-through-coding)[![PCEP and PCAP Python Certification Course course thumbnail](/images/pcep-python-certification.webp)Ages 15 and overPCEP and PCAP Python Certification CourseExact Python rules, including how range and slicing treat their end points.See the syllabus](/courses/pcep-pcap-python-certification-course)[![Python Masterclass course thumbnail](/images/python-college.webp)University and adultPython MasterclassPython from scratch to data work, with tests for every function.See the syllabus](/courses/python-programming-masterclass-zero-to-advanced-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)Mosman in the Census ## An older council area with many graduates Figures for the Mosman local government area (ABS code LGA15350) from the 2021 Census QuickStats, beside the state and national figures. | Headline | Mosman | | --- | --- | | Residents | 28,329 | | Median age | 45 | | Families | 7,723 | | Private dwellings | 13,399 | | Average people per household | 2.3 | | Measure | Mosman | NSW | Australia | | --- | --- | --- | --- | | Median age | 45 | 39 | 38 | | Homes that are flats or apartments | 52.0% (6,001) | 21.7% | 14.2% | | Homes that are separate houses | 34.9% (4,028) | 65.6% | 72.3% | | Adults with a bachelor degree or higher | 54.5% (12,938) | 27.8% | 26.3% | | Workers employed as professionals | 41.6% (5,881) | 25.8% | 24.0% | ### Six years older A median age of 45 puts Mosman six years above the state figure of 39. ### Working from home On Census day in the August 2021 lockdown, 8,321 employed residents, 58.8%, worked from home. ### Fewer drivers Only 19.8% of workers drove to work that day, against 43.1% across New South Wales. The bureau makes tiny random changes to table cells for privacy, so a column of QuickStats parts need not add up to the published total. That matters for the project below: we print the bands as published and do not add them together. Signature project ## Which age questions can the bands answer? We wrote 12 everyday age questions about Mosman and a small Python program that checks each one against the published five-year bands before answering. | Band as published | As a Python range | Residents | | --- | --- | --- | | 0-4 years | range(0, 5) | 1,220 | | 5-9 years | range(5, 10) | 1,522 | | 10-14 years | range(10, 15) | 1,871 | | 15-19 years | range(15, 20) | 1,619 | | 85 years and over | no upper end | 916 | | Outcome | Correct program | Program that forgets the +1 | | --- | --- | --- | | Answered by exactly one band | 5 | 1 | | Needs several bands (we do not add them) | 3 | 1 | | Cannot be answered from bands | 4 | 10 | | Questions where the two programs disagree | 6 of 12 | | ### One band "How many residents are aged 10 to 14?" matches a single band, so the answer is the published 1,871. ### Several bands "Aged 5 to 14" covers two whole bands. Adding them would give an unofficial figure, so the program reports that a single-year table is the right source. ### Cannot answer "Aged 12 to 17" starts and ends in the middle of bands. No arrangement of five-year groups can answer it. ### The one-character bug Writing range(5, 9) for "5-9 years" drops the nine-year-olds. With that mistake our program could no longer match "under 5", "aged 5 to 9", "aged 10 to 14" or "aged 15 to 19" to any band, and called them unanswerable. The questions, the classifier and its counts are ours. The band figures are published ABS values quoted directly; the program decides which questions they can serve and never manufactures new totals. The Python behind it ## Three lines that hold the whole idea Half-open ranges, which include the start and leave out the end, are how Python counts. The project is about translating between that and the inclusive labels people read. | Line of code | What it does | Common slip | | --- | --- | --- | | band = range(10, 15) | Holds the ages 10, 11, 12, 13 and 14 | Writing range(10, 14) and losing age 14 | | query = range(first, last + 1) | Turns "aged first to last" into a half-open range | Forgetting the + 1 | | query.start in starts and query.stop in stops | Checks the question lines up with band edges | Testing only the start | Half-open ranges are not a Python quirk; they make lengths easy (stop minus start) and let neighbouring ranges meet without overlapping, which is exactly what five-year bands need. ### Younger learners Sort pretend birthdays into Scratch boxes and test the edge cases: is a child who turns ten in the first box or the second? ### Secondary students Write the classifier, add tests for every edge, then break it on purpose and watch the tests catch it. ### Adults Apply the same checks to date ranges, price bands and report periods at work, where inclusive and exclusive ends cause real errors. Around Mosman ## A public school from 1880 More from the NSW schools file and calendar. ### Four government schools The NSW schools file lists Mosman Public School (first teacher 1880), Middle Harbour Public School (1916), Beauty Point Public School (1951) and Mosman High School (1961). ### The oldest band The Census counted 916 Mosman residents aged 85 and over, 3.2% of the population. ### Term 1, 2027 Eastern division schools begin Term 1 of 2027 on Wednesday 3 February; the term ends on Friday 9 April. One council, one suburb name Every Census figure here is for the Mosman council area as a whole, which covers neighbourhoods such as Beauty Point and Balmoral as well as Mosman itself. Learning ladder ## From sorting birthdays to testing every edge The ages below are only a guide; the trial lesson finds the right starting point. Ages 6 to 10 ### Scratch and sorting Games that sort, count and compare, built in blocks. [Scratch Coding for Kids](/courses/scratch-programming-complete-course)[Problem Solving and Computational Thinking for Kids](/courses/problem-solving-and-computational-thinking-for-kids)Ages 10 to 14 ### First Python Ranges, loops and conditions with a teacher checking every line. [Python and AI for Kids](/courses/python-ai-kids-masterclass)[Maths Through Coding](/courses/maths-through-coding)Ages 14 to 18 ### Python with tests Functions, edge cases and certification-level detail. [Python for Teens](/courses/python-complete-masterclass-teens)[PCEP and PCAP Python Certification Course](/courses/pcep-pcap-python-certification-course)University and adult ### Python for work Data handling, testing and automation for the workplace. [Python Masterclass](/courses/python-programming-masterclass-zero-to-advanced-college)[Data Analysis Course](/courses/data-analysis-mastery-course-college)Coding and AI ## An AI will write the range for you. Why should a Mosman learner check it? Because off-by-one errors look correct on the page and only show up when someone tests the edges. Ask an AI assistant to turn "5-9 years" into Python and it may return range(5, 9), range(5, 10) or a pair of inequalities. Two of those are fine. The other silently drops every nine-year-old, and nothing in the code looks wrong until a test asks about a child aged exactly nine. A learner who has built the age-band classifier knows to ask where each interval starts and stops, and writes the one test that settles it. That habit catches the same slip in dates, prices and loops, whoever wrote the first draft. The Mosman learner who can test an edge case is the one who can safely accept code from an AI. The longer argument is in [why teenagers should still learn to code in 2026](/blog/is-coding-worth-learning-2026). Delivery ## Beauty Point to Balmoral, all online Whether a learner is near Beauty Point or close to Balmoral, the live lesson arrives the same way, through the screen at home. ### From your desk There is no drive to a centre; the learner signs in and starts coding straight away. ### NSW stages Lesson plans follow the state syllabus stages and stop during NSW school holidays. ### A free real lesson The first class is taught in full and ends with a suggested course, level and time. ### Fifteen to twenty per group Groups are formed by level and pace, combining Mosman learners with others. ### Two lessons a week Two fixed lessons weekly, around eight a month, with any breaks agreed in advance. ### Teachers in India A 5pm Mosman lesson during daylight saving starts at 11:30am India time; after the clocks go back it starts at 12:30pm there. Daylight saving and India time Sydney moves its clocks on Sunday 4 October 2026 and Sunday 4 April 2027; India keeps one time all year. Our lesson times are always Sydney times. Fees ## Mosman class fees Three amounts cover everything. First class**USD 0** The first class costs nothing and closes with an honest recommendation. Group tuition**USD 100** A month of group lessons, typically eight, with fifteen to twenty learners at a similar level. Private tuition**USD 150** Around eight lessons a month, one teacher with one learner. Outside India, invoices are in US dollars, so the rate is the same for every Mosman family. Billing begins only after the trial, once a course and time are fixed; holidays, absences and format changes are covered on the pricing page. Request placement[Check availability](https://wa.me/919123366161?text=Hello%20Modern%20Age%20Coders%2C%20I%20would%20like%20a%20free%20coding%20or%20Python%20class%20for%20a%20learner%20in%20Mosman.)Reviews ## Google reviews from our families and learners 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 ## Book a first Mosman class Share the learner's age and an interest. A ten-year-old might start with a Scratch sorting game; an adult might start with the age-band classifier. ### Want a class sooner? Book a priority demo A priority demo is a full class of about 45 to 60 minutes. After the class the mentor sends a written skill report and a personal learning roadmap on WhatsApp. If you enrol, the demo fee is adjusted against your first month's fee. Share your demo Order ID with us on WhatsApp and we take it off. [Book a priority demo](/book-demo) ### Contact the team directly WhatsApp or call [+91 91233 66161](tel:+919123366161), or email [connect@modernagecoders.com](mailto:connect@modernagecoders.com). This is Modern Age Coders' actual contact, an Indian number, and not an invented Mosman one. [WhatsApp Modern Age Coders](https://wa.me/919123366161?text=Hello%20Modern%20Age%20Coders%2C%20I%20would%20like%20a%20free%20coding%20or%20Python%20class%20for%20a%20learner%20in%20Mosman.) Submitted details are used for placement and follow-up. FAQ ## Mosman coding and Python questions What Mosman families and adult learners ask us most. ### How many people live in the Mosman council area? The 2021 Census QuickStats for the Mosman local government area record 28,329 residents with a median age of 45. ### What is a half-open interval in Python? It is a range that includes its start but not its end. range(5, 10) holds 5, 6, 7, 8 and 9, so the published band "5-9 years" becomes range(5, 10), not range(5, 9). ### What does the Mosman age-band project show? Of 12 everyday age questions, 5 can be answered by one published band, 3 would need several bands added and 4 cannot be answered from bands at all. A program that forgets one +1 disagrees with the correct one on 6 of the 12. ### Why not just add two bands together? Because the bureau adjusts table cells slightly for privacy, so a sum of bands is not an official figure. The right step is to use a table with single years of age. ### Do children need to know Python first? No. Children from six start with Scratch and move to Python when they are ready, usually from about ten. ### Do you teach Copilot Studio agents in groups? No. Copilot Studio agents are taught one to one only; groups learn to build agents in Python. ### Do you have an office in Mosman? No. All lessons are live online, we have no premises in Australia, and the phone number we show is an Indian number. ### How much are coding classes for Mosman learners? The first lesson is free. After that, group lessons cost USD 100 a month for two live lessons a week, about eight a month, with fifteen to twenty learners, or USD 150 a month one to one. Course, format and time are agreed before payment. ### How many people are in a group? Fifteen to twenty, matched by level, pace and goals rather than age or suburb. One-to-one lessons are offered if no group suits the learner's time. ### Can adults learn Python with you? Yes. Adults learn in their own groups or one to one, often with a work task such as cleaning a spreadsheet in mind. Explore Sydney and NSW ## More for Mosman learners Nearby, [North Sydney](/ai-and-programming-classes-in-north-sydney-sydney) and [Lane Cove](/vibe-coding-and-ai-agents-classes-in-lane-cove-sydney) have pages of their own, and [the Northern Beaches](/ai-and-programming-classes-in-northern-beaches-sydney) begin across the Spit Bridge. The [Sydney page](/best-coding-classes-in-sydney) and the [New South Wales guide](/coding-and-ai-classes-in-new-south-wales) cover the rest. Book the free class[Book a priority demo](/book-demo)[Message us on WhatsApp](https://wa.me/919123366161?text=Hello%20Modern%20Age%20Coders%2C%20I%20would%20like%20a%20free%20coding%20or%20Python%20class%20for%20a%20learner%20in%20Mosman.)Free class[Priority demo](/book-demo)[Call us](tel:+919123366161) ## Keep exploring Modern Age Coders ### Related courses and guides - [Online Coding and Python Classes in Musselburgh](/online-coding-and-python-classes-in-musselburgh) - [Online Coding and Python Classes in Moreton Bay](/online-coding-and-python-classes-in-moreton-bay) - [Online Coding and Python Classes in Neath](/online-coding-and-python-classes-in-neath) - [Online Coding and Python Classes in Modbury, Adelaide](/online-coding-and-python-classes-in-modbury-adelaide) - [Online Coding and Python Classes in Nelson Bay](/online-coding-and-python-classes-in-nelson-bay) - [Online Coding and Python Classes in Maroondah, Melbourne](/online-coding-and-python-classes-in-maroondah-melbourne) - [Online Coding and Python Classes in Rugby](/online-coding-and-python-classes-in-rugby) - [Online Coding and Python Classes in Royal Leamington Spa](/online-coding-and-python-classes-in-royal-leamington-spa) - [Online Coding and Python Classes in Queanbeyan](/online-coding-and-python-classes-in-queanbeyan) ### Learn more - [Coding Classes for 10 Year Olds Online: Scratch to Python](/coding-for-10-year-olds) - [Coding for Class 5: Python, Scratch & AI Tools for 10 Year Olds](/coding-for-class-5) - [Data Science for Teens: Python & Your First ML Models](/courses/data-science-course-for-teens-python-data) - [Python for 9 Year Olds: First Python Programs, Turtle Graphics & Games](/python-for-9-year-olds) ### Free resources - [Python Tutorial for Beginners: Complete Guide](/resources/python) - [Inheritance and Polymorphism](/resources/python/inheritance-and-polymorphism) - [Comprehensions and Generators](/resources/python/list-comprehensions-and-generators) - [Modules and Packages in Python](/resources/python/modules-and-packages) ### From the blog - [Python Tutorials & Guides](/blog/topic/python) - [How Do Spam Filters Work? 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