New Features in Python 3.13: Updated REPL, GIL Removal, and Other Enhancements

In early October 2024, Python 3.13 was released, bringing a host of new features and improvements.

1 conda Installation of the New Version

Using Miniconda, you can create a Python 3.13 environment named py13 :

<code>conda create -n py13 python=3.13</code>

Activate the environment with:

<code>conda activate py13</code>

2 Feature 1: New Interactive REPL

The updated REPL now supports multi‑line editing, block‑level history navigation with the up/down arrows, automatic indentation after the first line, and direct entry of exit and help without parentheses.

These changes simplify code editing and execution compared with previous versions where each line had to be entered or edited individually.

3 Feature 2: Optional Removal of the Global Interpreter Lock (GIL)

Python 3.13 introduces a “free‑threaded” mode that allows you to run Python without the GIL, enabling true multi‑threaded execution on multiple CPU cores. This is achieved by installing a special no‑GIL build and selecting the option during installation.

Executable files are typically named python3.13t , and you can enable or disable the GIL at runtime.

4 Other Notable Features

Docstring whitespace stripping reduces bytecode cache size.

Extended comment syntax now supports lambdas and comprehensions inside class scopes.

Future statements from __future__ no longer trigger automatically.

Global declarations are now allowed inside blocks.

New environment variable PYTHON_FROZEN_MODULES controls frozen module handling.

Performance analysis tool perf gains a no‑frame‑pointer mode via -X perf_jit .

Configurable history file location via PYTHON_HISTORY .

Classes now expose __static_attributes__ and __firstlineno__ .

exec() and eval() accept globals and locals keyword arguments.

The article concludes with a reminder to follow the public account for more Python learning resources.