Localscope–Limit scope of Python functions for reproducible execution
localscope is a small Python package that disassembles functions to check if they access global variables they shouldn't. I wrote this a few years ago to detect scope bugs which are common in Jupyter notebooks. It's recently come in handy writing jax code (https://github.com/jax-ml/jax) because it requires pure functions. Thought I'd share.
Localscope–Limit scope of Python functions for reproducible execution launched on March 17, 2025 with 67 votes, #479 of 7,215 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Localscope is a Python package that analyzes functions by disassembling their code to detect unwanted access to global variables. Originally created to catch scope bugs common in Jupyter notebooks, it proves particularly useful for writing JAX code, which requires pure functions with no external dependencies. The tool helps developers identify and fix scope-related issues that can compromise reproducibility and correctness.
written from the facts on this page · September 2026
From the sources
Have you ever hunted bugs caused by accidentally using a global variable in a function in a Jupyter notebook ? Have you ever scratched your head because your code broke after restarting the Python kernel? localscope can help by restricting the variables a function can access. >>> from localscope import localscope >>> >>> a = 'hello world' >>> >>> @localscope ... def print_a (): ... print ( a ) Traceback (most recent call last): ... localscope.LocalscopeException : `a` is not a permitted global (file "...", line 1, in print_a) See the Interface section for an exhaustive list of options and the Motivation and Example for a more detailed example. $ pip install localscope Interface ¶…from localscope.readthedocs.io
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