code_blocksDOTCODE
Python runs in your browser

Learn to code by writing code, not by watching it.

162 lessons that start from nothing and end with you solving a real interview problem. Your code runs in this tab, with no installs and no setup, and it keeps working offline.

Start the coursearrow_forwardSee what is inside
  • check_circleFree account
  • wifi_offWorks offline
  • workspace_premiumVerifiable certificate
marks.pyIn your browser
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Output
0
lessons
across 8 modules
0
ask you to do something
exercises, debugging, projects
0 hrs
of taught material
1,083 minutes, measured
0
practice problems
in 656 curated sheets
What you get
Built for someone who has never written a line before.
Your code runs here, in this tab
Python compiles and executes in the browser, so there is nothing to install and nothing to configure. Close the wifi and it still runs.
Read on one side, write on the other
Every lesson is a two pane screen: the explanation stays on screen while you type, and the tests tell you the moment it works.
Errors are taught, not hidden
Ten lessons hand you a program that is already broken and ask you to fix it. IndentationError, IndexError and TypeError are each met on purpose, once, rather than by accident at midnight.
A final test that means something
30 questions in 90 minutes, mostly code. Tab switches are counted, leaving full screen pauses the paper, and your teacher sees every attempt.
A certificate anyone can check
Finish everything and the certificate carries a code. A recruiter can verify it without making an account, which is what makes it worth putting on a CV.
Then 17,666 problems to practise on
656 curated sheets, organised by company and by topic, with your progress tracked across all of them. The course ends by handing you straight to it.
The syllabus
Eight modules, from print to Two Sum.
Nothing is used before it is taught. Every module ends with a project that combines what it covered and introduces nothing new, and the last one ends on the single most asked interview problem there is.
  1. 1. Your first program
    13 lessons
    What Python is, running your first line, and reading an error without panic.
  2. 2. Values and variables
    37 lessons
    Numbers, text, input, and the type errors that catch everyone once.
  3. 3. Making decisions
    23 lessons
    Turning a rule written in English into a condition the computer can check.
  4. 4. Loops
    22 lessons
    Repeating work, counting, and the running best pattern you will reuse everywhere.
  5. 5. Lists and strings
    21 lessons
    Holding many values at once, and taking text apart.
  6. 6. Functions
    15 lessons
    Naming a piece of work so you can stop rewriting it.
  7. 7. Dictionaries and sets
    15 lessons
    Looking something up by name instead of by position.
  8. 8. How fast is it?
    16 lessons
    Why one program takes a second and another takes an hour, ending on Two Sum in linear time.
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Who it is for
Three people have to trust this, not one.
schoolIf you are learning
Start from absolutely nothing
  • checkNo prior programming, and no setup on your machine
  • checkExercises marked the moment you run them
  • checkA certificate you can put on a CV
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groupsIf you are teaching
Assign it, then see who is stuck
  • checkSet the course as an assignment for your class
  • checkEvery final test attempt, score and integrity count in one roster
  • checkQuizzes and marksheets you can export
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verifiedIf you are hiring
Check a certificate in one click
  • checkEvery certificate carries a verification code
  • checkNo account needed to check one
  • checkIt states what was tested, and what was not
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Write your first line of Python in the next two minutes.
No card, no download, no environment to set up. Make an account and Module 1 opens straight away.
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One thing said plainly: the final test marks its coding questions in your own browser, so the certificate reports which half was checked on our server rather than printing a single confident number.