Editor

Online Python Interpreter: Interactive Python Shell in Your Browser

Open the Interpreter

What Is a Python Interpreter?

A Python interpreter reads your code and runs it one statement at a time, so you see each result straight away, with no separate build step.

pythoncompiler.io puts a Python 3.13 interpreter in your browser. Open the Shell tab under the editor for the >>> prompt: type a line, press Enter and see the result. Variables from your last Run are there too, so you can inspect them.

Interpreter vs Compiler vs IDE - What's the Difference?

Interpreter
An interpreter executes code line by line at runtime. You write a statement, the interpreter runs it, and you see the output immediately. This is how Python works, and it suits exploring, debugging and learning.
Compiler
A compiler translates your entire program into machine code (or bytecode) before it runs. Languages like C, Rust, and Go use compilers. Python is interpreted, not compiled in the traditional sense - despite the common name “Python compiler.” Python does have an internal compilation step (source code to bytecode), but this happens automatically and invisibly as part of interpretation.
IDE (Integrated Development Environment)
An IDE is a full development environment that bundles an editor, an interpreter or compiler, file management and debugging tools into one application.

pythoncompiler.io gives you all three in one place: an interpreter for running code, a code editor for writing it, and IDE features for managing multi-file projects, installing packages, and exporting your work.

What You Can Do with the Interpreter

  • Test an expression. Type sorted([3, 1, 2], reverse=True) at the prompt and see what it returns.
  • Explore Python objects. Call type(), dir() and help() on any object to see its type, methods and documentation.
  • Debug piece by piece. Run your program, then inspect its variables at the prompt.
  • Learn interactively. See what each line does before writing the next. The getting started guide works this way.
  • Run data science code. NumPy, Pandas and Matplotlib load when you import them.

The shell, in the editor

The editor's Shell tab: three lines typed at the >>> prompt with their answers, after a file that set nums and total was runThe editor's Shell tab: three lines typed at the >>> prompt with their answers, after a file that set nums and total was run
  1. The Shell tab is Python's >>> prompt, beside the console.
  2. Type an expression and press Enter to see its value.
  3. Up and Down bring back earlier lines; an empty line ends a block.
  4. Run a file first and the shell keeps its variables, here nums and total.

Around the shell is a full editor: tabs for several files, Jupyter-style notebooks that export to PDF or HTML, file uploads, and packages that load when you import them. See also: run Python online and the full Python IDE.

Frequently asked questions

What is a Python interpreter?
A Python interpreter is a program that reads Python source code and executes it directly, line by line. When you type a Python statement, the interpreter processes it immediately and displays the result. A compiler, by contrast, translates the entire program into machine code before running any of it.
Is Python interpreted or compiled?
Python is interpreted. Technically, CPython (the standard implementation) compiles your source code to bytecode as an intermediate step, but this happens automatically and is invisible to you. The bytecode is then executed by the Python virtual machine. You never need to run a separate compilation step - you write code and run it directly. This is why Python is classified as an interpreted language, even though there's a bytecode compilation happening under the hood.
Can I use Python interactively online?
Yes. The Shell tab under the editor is Python's >>> prompt: type a line, press Enter and see the result. Variables from your last Run are there too. No installation or account is needed.
What's the difference between a Python interpreter and a Python compiler?
An interpreter executes code one line at a time at runtime, giving you immediate feedback after each statement. A compiler translates the entire program into executable code before any of it runs. Python uses an interpreter, which is why you can work interactively - type a line, see the result, type another line. Languages like C and Rust use compilers, which means you must compile the whole program before you can test it.
Does this support Python 3?
Yes. pythoncompiler.io runs Python 3.13, which supports all modern Python 3 features including f-strings, type hints, structural pattern matching (match/case), the walrus operator (:=), exception groups, and the complete standard library. Python 2 is not supported, as it reached end-of-life in January 2020.
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More: Python Tutorials · Online Python IDE · Python Code Editor · Run Python Online · Getting Started · Variables & Data Types