Brython documentation

Testing and debugging

Interactive test

The Brythons site, or its mirror available for download, include a console where you can test Python code.

Please note that the namespace is not refreshed when you click on "run", you must reload the page for that.

For debugging and testing Brython, a number of test scripts are grouped in the directory tests ; you can access them by clicking the link "Test pages" in the console, then select the different tests and run them.

Debugging scripts

Whatever the debugging level, syntax errors are reported in the browser console (or at the place defined by sys.stderr)

For instance, the code

x = $a

generates the message

SyntaxError: unknown token [$]
module '__main__' line 1
x = $a
    ^

By setting the debugging level to 1 in the call to function brython(debug_mode), the exceptions raised at runtime and not caught by an except also produce an error message, as close as possible to the one generated by Python3.

This code :

x = [1, 2]
x[3]

generates :

IndexError: list index out of range
module '__main__' line 2
x[3]

Introduction

Installation

Limitations of the "file" protocol

Frequently asked questions

Syntax, keywords and built-in functions

Standard distribution

`import` implementation

Brython packages

Browser interface

Brython-specific built-in modules

Working with Brython

Cookbook

Testing and debugging

Interactive test

Debugging scripts