Spread out exercises in each episode

[aays]

Addresses #165. No content was removed or added - just moved the placement of exercises in each episode. This touches nearly every episode so feedback is more than welcome!

I tried to consider lesson flow and what might be good timing for formative assessments, but in some episodes felt it was better to leave 2-3 exercises for the very end.

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-python-intro/compare/md-outputs..md-outputs-PR-188

The following changes were observed in the rendered markdown documents:

 conditionals.md       |  92 ++++++++--------
 data-visualisation.md |  99 ++++++++---------
 for-loops.md          |  63 +++++------
 getting-started.md    |   4 +-
 libraries.md          |  89 ++++++++--------
 lists.md              | 109 +++++++++----------
 looping-data-sets.md  | 102 +++++++++---------
 md5sum.txt            |  22 ++--
 pandas.md             | 205 ++++++++++++++++++------------------
 tidy.md               |  71 +++++++------
 variables.md          | 286 +++++++++++++++++++++++++-------------------------
 writing-functions.md  | 124 +++++++++++-----------
 12 files changed, 640 insertions(+), 626 deletions(-)

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⏱️ Updated at 2026-10-03 21:03:51 +0000

[aays]

Found a stray dash here

[aays]

Minor cleanup

[aays]

This episode has the most changes. I'm afraid this makes the diff a bit harder to read directly too - sorry! Might be easier to open up the file on this branch and Cmd+F for 'challenge' to see the new challenge placements.

Might have overdone it a bit - perhaps it is better sometimes to review several concepts at once with back-to-back challenges. Would appreciate thoughts!