How to use this developer tool
- Paste Python code.
- Choose plain, numbered, or escaped-HTML output.
- Enter an optional search term.
- Render the viewer.
- Copy the safe display output or download it.
#135 · Programming Languages Developer Tool
Python Viewer
View Python source safely with line numbers, optional wrapping, basic token labeling, search matches, and a clean copy-ready output. The tool never executes the code and processes the file entirely in your browser.
Developer Input
Source codeAd space
What this developer tool does
It creates a non-executing representation of source code and can mark text or regex matches. HTML mode escapes every special character before output.
Read text → calculate lines → search without execution → add optional line numbers or match markers → return safe output.
The output textarea displays text, not executable markup. Syntax highlighting is intentionally lightweight without external libraries.
Example
Input
def greet(name):
return f"Hello, {name}"Output
1 │ def greet(name):
2 │ return f"Hello, {name}"Tips for better output
- Use line-numbered mode when reviewing errors.
- Use escaped HTML when embedding code into documentation.
- Disable wrap when preserving long-line structure matters.
FAQ
How do I view Python code with line numbers online?
Choose Line-numbered Text and render the code.
How can I search inside a large Python file?
Enter a search term and render; the match count appears in the summary.
Is there an online Python viewer with syntax highlighting?
This viewer provides safe text rendering and match marking without an external highlighting library.
How do I copy specific lines from Python code?
Use line-numbered output to locate the lines, then select and copy the relevant text.
Can I view Python code safely without executing it?
Yes. The viewer treats all input as text and never runs Python code.
Related developer tools
Viewer modes
| Numbered | Adds stable line references |
|---|---|
| Plain | Preserves source text |
| Escaped HTML | Safe markup embedding |
| Search | Text or regular expression |