Update 14-looping-data-sets.md

[wgriffa]

If you run the original command,
print(p.parent), print(p.stem), print(p.suffix)

The output is,
data
gapminder_gdp_africa
.csv

(None, None, None)

The last line is confusing, "(None, None, None)"

You're essentially doing three separate print calls and then creating a tuple with their return values. The print function in Python doesn't return any meaningful value (it returns None), so when you group them together with commas, you're creating a tuple of their return values, which is (None, None, None).

To get a clean output like you see in the lessons, you have to write the print statement on three separate lines.

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⏱️ Updated at 2023-10-17 12:27:20 +0000

[alee]

Agreed, thanks for the PR!