nteract/papermill

s3 handler decode exception

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#820 opened on Aug 6, 2025

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 (0 comments) (0 reactions) (0 assignees)Python (5,381 stars) (402 forks)batch import
bughelp wanted

Description

🐛 Bug

https://github.com/nteract/papermill/blob/53847310586b74fdb2763fe333ab99babee367ed/papermill/s3.py#L320C21-L320C73

This bug happens because undecoded is a bytes object, but s.decode(encoding) returns a str. this wll causes a TypeError

Contributor guide

Tech stack
python
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic python
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80
Research direction
The bug is in papermill/s3.py at line 320. The variable 'undecoded' is a bytes object, and calling decode(encoding) returns a str, causing a TypeError. The fix likely involves either using .decode() properly or handling the bytes object differently. Check the surrounding code for context.