Python 3.12 · NumPy · SciPy · Matplotlib

Online Python Compiler & Editor

Name: myCompiler Python
Author: myCompiler

myCompiler is a free online Python compiler, editor and code runner that lets you write, run, and share Python code directly in your browser. It works as your Python playground, sandbox, fiddle, cloud compiler, and online REPL. No downloads, no installation needed. Just open the editor and start coding with syntax highlighting, autocomplete, and instant output.

Start coding in Python How it works

27+ languages Used by 1M+ developers Free forever

main.py

import numpy as np

# Weekly temperature data (°C)
temps = np.array([23, 18, 31, 27, 22, 35, 19])
days = ["Mon", "Tue", "Wed", "Thu",
        "Fri", "Sat", "Sun"]

warmest = days[temps.argmax()]
above_25 = (temps > 25).sum()

print(f"Average: {temps.mean():.1f}°C")
print(f"Warmest: {warmest} at {temps.max()}°C")
print(f"Days above 25°C: {above_25}")

Output

Average: 25.0°C Warmest: Sat at 35°C Days above 25°C: 3

How to run Python code online

Three steps to go from idea to running Python code in this online playground. No account required.

Write your code

Open the Python editor and start writing. The smart editor gives you syntax highlighting, autocomplete, and error detection as you type.

Click Run

Hit the Run button or press +Enter to run your Python code on secure, sandboxed cloud servers.

See results

Output appears instantly in the integrated terminal. Errors and exceptions show up with clear, helpful messages.

Everything you need to code in Python

A complete online Python IDE and coding playground in your browser. Write, run, and share code without any setup.

Zero setup required

Start coding in seconds with this browser-based Python interpreter. No downloads, no installations, no environment configuration. Open your browser, go to myCompiler, and start writing Python code immediately.

Works on any device with a web browser. Desktop, laptop, tablet, phone, Chromebook. There is nothing to install and nothing to configure.

Feature-rich code editor

Write Python with a professional-grade code editor built into your browser. Syntax highlighting colors your code for readability, making keywords, strings, and functions easy to distinguish at a glance.

Intelligent autocomplete suggests methods and properties as you type, and real-time error detection catches mistakes before you run your code.

Multi-file projects

Create and manage multiple files in a single project. Use the file sidebar to organize your code into modules, then import them across files just like in a desktop IDE.

Build modular applications with proper project structure. Each file is editable, and you can switch between them instantly.

Run code instantly

Click the Run button or press +Enter to execute your Python code instantly. This online code runner displays output immediately in the integrated terminal panel. Your code runs on secure, sandboxed cloud servers and results appear in seconds.

Error messages and tracebacks are displayed clearly, making it easy to find and fix issues. The terminal supports ANSI colors for rich output formatting.

Ready to try it? Write and run your first Python program in seconds.

Open Python editor

Python 3.12 with popular libraries

myCompiler runs Python 3.12, the latest stable version. You get improved error messages, modern language features, and better performance right out of the box. Popular scientific and data libraries come pre-installed so you can start working immediately.

numpy scipy matplotlib scikit-learn

NumPy handles numerical computing and array operations. SciPy provides scientific functions. Matplotlib creates plots and data visualizations. scikit-learn gives you machine learning algorithms ready to use.

Try Python with libraries

Python code examples

Common Python patterns you can try in the online compiler. Each example is ready to run.

Hello World in Python

main.py

print("Hello, World!")

Variables and Data Types in Python

main.py

name = "Alice"
age = 30
height = 5.6
is_student = True
print(f"{name} is {age} years old")

If-Else Conditionals in Python

main.py

x = 10
if x > 0:
    print("Positive")
elif x == 0:
    print("Zero")
else:
    print("Negative")

For and While Loops in Python

main.py

for i in range(5):
    print(f"Count: {i}")

total = 0
while total < 10:
    total += 3
print(f"Total: {total}")

Functions in Python

main.py

def greet(name, greeting="Hello"):
    return f"{greeting}, {name}!"

print(greet("Alice"))
print(greet("Bob", "Hi"))

Arrays and Collections in Python

main.py

fruits = ["apple", "banana", "cherry"]
fruits.append("date")
print(fruits[1])

person = {"name": "Alice", "age": 30}
print(person["name"])

Classes and Objects in Python

main.py

class Dog:
    def __init__(self, name, breed):
        self.name = name
        self.breed = breed

    def bark(self):
        return f"{self.name} says Woof!"

dog = Dog("Rex", "Labrador")
print(dog.bark())

Error Handling in Python

main.py

try:
    result = 10 / 0
except ZeroDivisionError as e:
    print(f"Error: {e}")
finally:
    print("Done")

File I/O in Python

main.py

# Write to file
with open("output.txt", "w") as f:
    f.write("Hello, File!")

# Read from file
with open("output.txt", "r") as f:
    print(f.read())

List Comprehensions in Python

main.py

numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
evens = [n for n in numbers if n % 2 == 0]
squares = [n ** 2 for n in numbers]
print(f"Evens: {evens}")
print(f"Squares: {squares}")

Try these examples in the editor

How to take input in Python online

myCompiler supports standard input (stdin) for Python programs. Use Python's standard input functions to read user input. Enter your input data in the stdin panel before running your program.

This works for both single-line and multi-line input. You can read strings and convert to numbers using the language's built-in I/O functions.

Try it yourself

main.py stdin supported

name = input("What is your name? ")
age = int(input("How old are you? "))

print(f"Hello {name}!")
print(f"You'll be {age + 1} next year.")

stdin

Alice
25

Output

Hello Alice!
You'll be 26 next year.

No setup, no sign-up. Start writing Python code right now.

Start coding now

Getting started with Python online

You can start writing and running Python code right now without installing anything. Type your code, and click Run. This free Python code runner executes your program instantly and displays the output in the terminal panel below the editor. Open the Python online editor, type your code, and click Run.

If you're new to Python, use this online Python playground to start with the basics like variables, data types, conditionals, and loops. The code examples above cover all the fundamentals you need to get started. Each example can be copied into the sandbox and run immediately. No setup, no configuration.

As you progress, try creating multi-file projects, using libraries, and sharing your programs with others via URL. Sign up for a free account to save your work and build a personal library of programs. myCompiler works as a full online Python IDE right in your browser.

Who uses myCompiler

Whether you're learning to code, preparing for interviews, or prototyping ideas, myCompiler is built for you.

Students & Learners

Practice exercises, complete homework assignments, and experiment with code without installing anything on school or personal computers.

Teachers & Educators

Share code examples with students via unique URLs. Embed the compiler in course materials so students can run examples directly in the browser.

Interview Candidates

Practice coding interview problems, test algorithms, and verify solutions quickly during preparation for technical interviews.

Professional Developers

Quickly prototype ideas, test code snippets, or try out a library without setting up a local environment. Great for quick experiments.

Content Creators & Bloggers

Embed interactive examples in blog posts, tutorials, and documentation so readers can run code without leaving the page.

Teams & Collaborators

Share code snippets with colleagues via URLs. Others can view, run, and fork your code to build on your work.

myCompiler vs. local IDE

Why use an online Python compiler instead of installing one locally?

Feature	myCompiler	Local IDE
Setup time	Instant	Minutes to hours
Installation	None required	Python + IDE required
Device support	Any browser	Desktop only
Sharing code	One-click URL	Manual (file, git, etc.)
Languages	27+ in one place	One at a time
Cost	Free forever	Free to $$$
Works on Chromebook	Yes	Limited

What is Python?

Python is a high-level, interpreted programming language known for its clear syntax and readability. Created by Guido van Rossum and first released in 1991, Python has become one of the most popular programming languages in the world, consistently ranking in the top three on TIOBE and Stack Overflow's Developer Survey.

Python's design philosophy emphasizes code readability with significant use of indentation. Its language constructs and object-oriented approach help programmers write clear, logical code for projects of any size.

What is Python used for?

Python is widely used for web development with frameworks like Django and Flask, data science and analytics with pandas and NumPy, machine learning and AI using TensorFlow, PyTorch, and scikit-learn, automation and scripting, scientific computing with SciPy, and education. The extensive standard library and vast ecosystem of third-party packages make Python suitable for nearly any programming task.

Python for beginners

Python is widely recommended as a first programming language because of its simple, readable syntax that resembles plain English. Unlike languages like C++ or Java, Python doesn't require you to declare variable types, manage memory, or write boilerplate code. A "Hello World" program in Python takes just one line. Type print("Hello, World!") and you're done. This makes it ideal for learning programming fundamentals like variables, loops, functions, and data structures.

Python vs other languages

Compared to JavaScript, Python has a cleaner syntax and is more popular for data science and backend development. Compared to Java, Python is more concise, has a gentler learning curve, and doesn't require boilerplate code. Compared to C++, Python is easier to learn, handles memory automatically, and runs on any platform without recompilation. The tradeoff is that Python runs slower than compiled languages, but for learning, prototyping, and most real-world applications, this difference rarely matters.

Why use an online Python compiler?

An online Python compiler, also called a Python playground, sandbox, or code runner, lets you write and run Python code directly in your web browser without installing Python on your computer. Think of it as a Python fiddle or REPL that you can access from anywhere. It's useful for quick prototyping, learning Python, testing code snippets, sharing solutions, coding interviews, and working from any device including phones, tablets, and Chromebooks.

myCompiler's online Python IDE includes Python 3.12 with popular scientific libraries pre-installed, multi-file project support, standard input (stdin), and the ability to save, share, and embed your code. Whether you call it an interpreter, code executor, or cloud compiler, it's completely free.

Why is Python so popular?

Python's popularity comes from its simplicity and versatility. It has a massive community, thousands of open-source libraries, and excellent documentation. Companies like Google, Netflix, Instagram, and Spotify use Python extensively. It's the go-to language for data science, machine learning, web development, and automation. For beginners, the readable syntax and gentle learning curve make it the most accessible programming language to start with.

Python career opportunities

Python developers are in high demand across industries. Common roles include software engineer, data scientist, machine learning engineer, DevOps engineer, backend developer, and automation engineer. Learning Python opens doors to a wide range of career paths in technology.

Try Python online Free · No sign-up needed

Keyboard shortcuts

Code faster with these keyboard shortcuts in the myCompiler editor.

Run code

+ Enter

Save program

+ S

Toggle comment

+ /

Indent line

Tab

Unindent line

Shift + Tab

Undo

+ Z

Select next occurrence

+ D

Find & replace

+ H

Embed the Python compiler on your website

Add an interactive Python compiler to your website, blog, or learning platform. Readers can write and run Python code directly on your page without leaving it.

Perfect for technical tutorials, coding courses, documentation, and educational content. Save a program on myCompiler and use the embed link to add it to any webpage.

Embedded Python compiler, editor and code runner

HTML

<iframe
src="https://www.mycompiler.io
    /embed/python"
width="100%"
height="400"
frameborder="0">
</iframe>

Why developers choose myCompiler

A full-featured online IDE for Python and 27+ other programming languages.

27+ Languages

Python, JavaScript, Java, C++, Rust, Go, TypeScript, C#, and many more. All compilers and interpreters in one place. Switch languages instantly.

Dark & Light Mode

Switch between light and dark themes with one click. Code comfortably in any lighting condition, day or night.

Mobile Friendly

Fully responsive editor optimized for phones, tablets, and Chromebooks. Code on any device with a web browser. No app download needed.

Save & Share Code

Save programs to your account, share via unique URLs, and let others view, fork, and run your code. Great for collaboration and code reviews.

Tags & Organization

Organize your saved programs with tags and find them quickly with search and filters. Build a personal library of code snippets and solutions.

No Account Required

Start writing and running code immediately. No sign-up, no email, no credit card. Create a free account later only if you want to save your work.

Explore more programming languages

myCompiler supports 27+ languages. Switch between them anytime. All free, all in one place.

View all 27+ languages

Frequently asked questions

Common questions about using the online Python compiler, playground, and code runner.

Yes! myCompiler is completely free for all supported languages including Python. There are no subscriptions, no premium tiers, and no hidden costs. Every feature is available at no charge.

myCompiler keeps its Python environment up to date. You can see the exact version on the language details section of this page. We regularly update all language runtimes to their latest stable versions.

Yes! myCompiler provides popular Python libraries including NumPy, Pandas, Matplotlib, SciPy, and scikit-learn. You can import and use them directly in your code without any setup.

Simply open the Python editor, write or paste your code, and click the Run button. Your code will be executed on our servers and the output will appear in the terminal panel within seconds.

Yes. Click Save to store your program. You will receive a unique URL that you can share with anyone. Recipients can view, fork, and run your code.

Yes. myCompiler supports multi-file projects. You can create, rename, and delete files in the sidebar. This lets you organize your Python code just like in a local IDE.

Yes. All code runs in isolated containers on our servers. Each execution gets its own sandboxed environment that is destroyed after completion. Your code cannot affect other users or our infrastructure.

Yes. myCompiler has a responsive design optimized for phones and tablets. You can write and run Python code on the go. The mobile interface uses tabs for switching between the editor, output, and file panels.

Yes. Click the Input tab in the bottom panel, type or paste your input data, then click Run. Your program will read from the input you provided.

Execution is fast. Code runs on our optimized cloud infrastructure and output typically appears within seconds. Execution time depends on the complexity of your program.

Yes. myCompiler provides an embed feature. You can copy an iframe snippet and paste it into your website, blog, or documentation. Visitors can edit and run code directly on your page.

myCompiler supports common editor shortcuts including Run (Ctrl/Cmd+Enter), Save (Ctrl/Cmd+S), Find (Ctrl/Cmd+F), and more. See the keyboard shortcuts section on this page for the full list.

No. myCompiler requires an internet connection because code is compiled and executed on our cloud servers. The editor itself loads in your browser, but running code requires connectivity.

myCompiler offers a fast, free, zero-setup environment with a modern code editor, multi-file support, dark mode, and instant sharing. It is ideal for learning, prototyping, interviews, and sharing code examples.

Yes. myCompiler is great for practicing algorithms and coding problems. You can write Python code, provide custom input, and test your solutions instantly. Save your work and come back to it anytime.

Use print statements or console output to trace your program's behavior. myCompiler shows all standard output and error messages in the terminal panel. Error messages include line numbers to help you locate issues.

Ready to write Python code?

Open the free Python playground and start coding immediately. No downloads, no account required.

Start coding in Python

Free · No sign-up required · Python 3.12