Online Coding and Python Classes in Mosman, Sydney

Course 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.

Ages 13 to 17

Python for Teens

Ranges, loops, conditions and functions, practised on small public tables like the Mosman age bands.

See the syllabus

Ages 10 to 15

Maths Through Coding

Intervals, inequalities and counting explained by writing short programs.

See the syllabus

Ages 15 and over

PCEP and PCAP Python Certification Course

Exact Python rules, including how range and slicing treat their end points.

See the syllabus

University and adult

Python Masterclass

Python from scratch to data work, with tests for every function.

See the syllabus

Browse the course atlas for more than one hundred options and use the 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 codingAges 13 to 17

Vibe Coding for Teens

Python, web and AI projects where the learner still owns the thinking.

See the syllabus

Python and AICollege and adult

Python Automation Course

Automate the work you already do, then let AI carry part of it.

See the syllabus

AI and MLAges 14 to 18

AI and Machine Learning for Teens

Train a model, read what it learned, and be able to say why it is wrong.

See the syllabus

Agentic codingProfessionals

Codex & Claude Code

Run AI coding agents on real work without losing control of the codebase.

See the syllabus

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.

Mosman, 2021 Census headline counts
Headline	Mosman
Residents	28,329
Median age	45
Families	7,723
Private dwellings	13,399
Average people per household	2.3

Mosman beside NSW and Australia
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.

Some of Mosman's published age bands (ABS Census 2021 QuickStats)
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

How our 12 questions sort out (our calculation)
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.

From a published label to a safe check
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 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 Maths Through Coding

Ages 14 to 18

Python with tests

Functions, edge cases and certification-level detail.

Python for Teens PCEP and PCAP Python Certification Course

University and adult

Python for work

Data handling, testing and automation for the workplace.

Python Masterclass Data Analysis Course

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.

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 classUSD 0

The first class costs nothing and closes with an honest recommendation.

Group tuitionUSD 100

A month of group lessons, typically eight, with fifteen to twenty learners at a similar level.

Private tuitionUSD 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

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.

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 and Lane Cove have pages of their own, and the Northern Beaches begin across the Spit Bridge. The Sydney page and the New South Wales guide cover the rest.

Book the free class Book a priority demo Message us on WhatsApp

Courses that make ranges second nature

Python for Teens

Maths Through Coding

PCEP and PCAP Python Certification Course

Python Masterclass

Python, AI, vibe coding and agentic coding

Vibe Coding for Teens

Python Automation Course

AI and Machine Learning for Teens

Codex & Claude Code

An older council area with many graduates

Six years older

Working from home

Fewer drivers

Which age questions can the bands answer?

One band

Several bands

Cannot answer

The one-character bug

Three lines that hold the whole idea

Younger learners

Secondary students

Adults

A public school from 1880

Four government schools

The oldest band

Term 1, 2027

From sorting birthdays to testing every edge

Scratch and sorting

First Python

Python with tests

Python for work

An AI will write the range for you. Why should a Mosman learner check it?

Beauty Point to Balmoral, all online

From your desk

NSW stages

A free real lesson

Fifteen to twenty per group

Two lessons a week

Teachers in India

Mosman class fees

Google reviews from our families and learners

Book a first Mosman class

Mosman coding and Python questions

How many people live in the Mosman council area?

What is a half-open interval in Python?

What does the Mosman age-band project show?

Why not just add two bands together?

Do children need to know Python first?

Do you teach Copilot Studio agents in groups?

Do you have an office in Mosman?

How much are coding classes for Mosman learners?

How many people are in a group?

Can adults learn Python with you?

More for Mosman learners

Keep exploring Modern Age Coders

Related courses and guides

Learn more

Free resources

From the blog

Start here