Kōdlet User Guide

Everything you need to know to write, run, and share code on kōdlet.

Project Types

When you create a new kodlet, choose your project type:

Type	What you get
Python	A main.py file. Add more .py files, data files (.csv, .txt, .json, etc.), and import them normally.
Web	index.html, style.css, and script.js files. The output pane renders the page live.

Writing and Running Code

• Click Run (or press Ctrl+Enter / Cmd+Enter) to execute your code.
• Click Stop to halt a running program. Programs that run longer than 30 seconds are stopped automatically.
• The editor supports multi-file projects. Click + in the tab bar to add a file.
• For Python projects, all files are written to a virtual filesystem at run time. Use open("data.csv") to read a file you've added to the editor.

Using input()

The input() function works in Python kodlets. When your program calls input(), a terminal strip appears below the output and waits for you to type. Press Enter to submit.

name = input("What is your name? ")
print("Hello,", name)

Keyboard Shortcuts

Action	Shortcut
Run	Ctrl+Enter / Cmd+Enter
Toggle comment	Ctrl+/ / Cmd+/
Indent selection	Tab
Unindent selection	Shift+Tab

Saving and Sharing

• Click Save to save your kodlet. You must be logged in.
• A dot (·) on the Save button means you have unsaved changes.
• After saving, click Share to copy a link, or Embed to get an iframe snippet.
• Kodlets can be public (anyone with the link) or private (only you).
• Click Remix on any kodlet to create your own editable copy.

Embedding

Embed code is available for public kodlets only. Copy the iframe snippet from the Embed menu and paste it into any webpage or LMS.

The embedded view lets visitors read and run the code. They can edit locally in their browser but changes are not saved — your original is unaffected. Logged-in users can click Remix to save their own copy.

For stateless embeds (no saved kodlet required):

https://kodlet.io/embed/inline?lang=python&code=BASE64_ENCODED_CODE

Available Python Libraries

Standard library

All standard Python modules work: math, random, statistics, datetime, time, calendar, collections, itertools, functools, json, csv, re, io, string, sys, copy, enum, dataclasses, pathlib, os.path, and more.

Built into Kōdlet

Library	What it's for
turtle	Turtle graphics — move a turtle around a canvas to draw shapes and animations
image	Image processing — open, modify, and display image files (cImage / ThinkCSpy compatible)

Loaded automatically when imported

Library	What it's for
matplotlib / matplotlib.pyplot	Charts, graphs, and plots

Also available (via Pyodide)

Library	What it's for
numpy	Numerical computing — arrays, linear algebra, math operations

Kōdlet runs Python entirely in your browser via Pyodide. If there's a library you'd like supported, contact us.

Turtle Graphics

Kōdlet's turtle module is compatible with Python's standard turtle library and with Trinket.io turtle programs. Supported features include:

• Movement: forward, backward, left, right, goto, setx, sety, home
• Pen: penup, pendown, pencolor, fillcolor, begin_fill, end_fill, pensize, speed
• Appearance: shape, shapesize, showturtle, hideturtle, stamp
• Screen: bgcolor, bgpic, title, setup, screensize
• Events: onkey, onkeypress, onkeyrelease, onclick, ontimer
• Text: write
• Multiple turtles: Turtle(), turtles(), getturtle()
• Loop control: mainloop, done, exitonclick, bye

Programs that use onkey() or ontimer() without calling mainloop() explicitly will work correctly — Kōdlet starts the event loop automatically.

Image Processing

The image module is compatible with the cImage library used in How to Think Like a Computer Scientist (Runestone / ThinkCSpy).

import image
img = image.Image("photo.jpg")   # file must be in the editor's file list
for row in range(img.getHeight()):
    for col in range(img.getWidth()):
        p = img.getPixel(col, row)
        img.setPixel(col, row, image.Pixel(p.getRed(), 0, 0))
win = image.ImageWin()
img.draw(win)

Importing from Trinket

If you have existing projects on Trinket.io, you can import them all at once:

1. Log in to Trinket.io and go to your account settings.
2. Download your Trinket export ZIP file.
3. On Kōdlet, go to /import and upload the ZIP.
4. All your trinkets are imported as kodlets, including any images and assets.

Python and HTML/CSS trinkets are fully supported. PyGame trinkets are imported as Python projects with a note that PyGame is not yet supported.

Tips

• Escape sequences like \n and \t inside strings are highlighted in blue so they're easy to spot.
• Font size can be adjusted with the A− and A+ buttons in the tab bar.
• Reset restores the original starter code if you've made changes you want to undo.
• To import another .py file in your project, use a standard import statement: import mymodule.