nteract/papermill

Parameter strings cannot contain "="

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#864 opened on Feb 28, 2026

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Description

🐛 Bug

# %% tags=["parameters"]

s = "a=b"

# %%
print(s)

This fails with: Passed unknown parameter: s`". Seems like papermill naively counts = on the parameter line, so it's treated as unparseable, then flagged as “unknown parameter”.

Papermill version: 2.6.0.

Contributor guide

Research direction
Inspect the parameter parsing logic in papermill's codebase. Focus on how parameters are extracted from notebook tags and identify where the naive splitting on '=' occurs. Modify the parsing to handle '=' within parameter values.
Tech stack
python
Domain
clidevops
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.
1-3 hours
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Python
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70