donnemartin/data-science-ipython-notebooks

pandas - Working with Strings

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#60 opened on Oct 20, 2018

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 (3 comments) (0 reactions) (0 assignees)Python (26,379 stars) (7,706 forks)batch import
bughelp wanted

Description

In the code cell 3: data = ['peter', 'Paul', None, 'MARY', 'gUIDO'] data.map(lambda s: s.capitalize()) was changed to [s.capitalize() for s in data if s!= None ] and now the code woks fine.

Contributor guide

Tech stack
pythonpandas
Domain
data
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.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Python basicspandas usage
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80
Research direction
The issue involves a specific code cell in a Jupyter notebook within the repository. The user reports that using `data.map(lambda s: s.capitalize())` on a list containing None causes an error, and suggests replacing it with a list comprehension that filters out None values. A contributor should locate the relevant notebook file (likely under the 'python/' or similar directory) and apply the fix. The change is straightforward and can be verified by running the cell. No new dependencies or complex changes are needed.