colablinter 0.0.13

Linting and formatting Python code in Google Colab.

colablinter

Overview

colablinter is an IPython magic command extension designed specifically for Jupyter and Google Colab notebooks.

It integrates the high-speed linter ruff and import sorter isort to perform code quality checks, fix issues, and enforce formatting standards.

It allows developers to lint and format code on a cell-by-cell basis or check the entire notebook with simple commands.

Magic cell Commands

Command	Type	Role	Description
%%cl_check	Cell Magic	Quality Check	Displays a linting report for the current cell's code.
%%cl_format	Cell Magic	Format Preview	Formats the current cell's code.
%cl_check	Line Magic	Quality Check	Displays a linting report for the entire saved notebook (requires Google Drive mount).
%cl_auto_format	Line Magic	Auto Format	Activates or deactivates automatic code formatting before every cell execution.

After executing a magic command, the original code of the cell is executed (if applicable to the command).

Installation

Requires Python 3.12 or newer.

pip install colablinter

Usage

The extension must be explicitly loaded in the notebook session before use.

%load_ext colablinter

1. Check cell quality (%%cl_check)

   Use %%cl_check to see linting reports for the code below the command.

   %%cl_check
   
   def invalid_code(x):
       return x + y # 'y' is not defined
   

   Output examples:

   ---- Code Quality & Style Check Report ----
   F821 Undefined name `y`
   --> notebook_cell.py:3:16
   |
   2 | def invalid_code(x):
   3 |     return x + y # 'y' is not defined
   |                  ^
   |
   
   Found 1 error.
   -------------------------------------------
   

   Note: After the report is displayed, the code in the cell executes as normal. If errors exist (like F821), execution will fail.

2. Format cell preview (%%cl_format)

   %%cl_format runs the formatter and corrects code. The cell executes the original code.

   %%cl_format
   import sys
   import os
   def calculate_long_sum(a,b,c,d,e,f):
       return (a+b+c)*(d+e+f)  # messy
   

   Replaced code:

   import os
   import sys
   from datetime import datetime
   
   
   def calculate_long_sum(a, b, c, d, e, f):
       return (a + b + c) * (d + e + f)  # messy
   

3. Check entire notebook (%cl_check)

   Use line magic %cl_check to check across the entire saved notebook file (requires the notebook to be saved to Google Drive and mounted).

   %cl_check
   

4. Activate/Deactivate Auto Format (%cl_auto_format) The %cl_auto_format line magic allows you to automatically format code before every code cell is executed.

   To Activate Auto Formatting:

   %cl_auto_format on # off when you want to deactivate