Add illustration for visual intuition of indexing and slicing

[unode]

This illustration has been used to help beginners understand why the last digit of a slice doesn't imply including another element.

The intuition makes a distinction between indexing, the number of the position, and slicing, the number of the gap between elements.

For step based slices, the alternative intuition is to create rows with the values and keeping only the first row.

@tobyhodges

[github-actions]

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🔍 Inspect the changes: https://github.com/swcarpentry/python-novice-inflammation/compare/md-outputs..md-outputs-PR-1118

The following changes were observed in the rendered markdown documents:

 04-lists.md                           |    3 +
 fig/python_indexing_slicing.svg (new) | 1092 +++++++++++++++++++++++++++++++++
 md5sum.txt                            |    2 +-
 3 files changed, 1096 insertions(+), 1 deletion(-)

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⏱️ Updated at 2026-04-28 14:26:38 +0000