Sync python-formatted-output with the updated tutorial

[realpython-bot]

Syncs python-formatted-output/ with the maintenance update of A Guide to Modern Python String Formatting Tools.

• Update draft (source of truth): https://realpython.com/pbjt/blog/post/2386/change/
• Maintenance card: https://trello.com/c/YTjic4Sc

What changed

format.py

• Added the new Python 3.14 grouping-after-precision example the update introduces in The grouping Component section, right after the thousand-separator examples:

  print(f"{1.23456789:.8_f}")
  print("{0:.8_f}".format(1.23456789))

• Renamed prec to precision in the dynamic-format-specifier examples, so the script matches the variable name the article's code blocks use. (Pre-existing drift, picked up while syncing the folder to the article's current state.)

interpolation.py (all pre-existing drift against the live article, fixed in the same pass)

• The first commented-out pair now contrasts the f and F prefixes, which is what the article's first block demonstrates; it previously repeated the quote-style contrast of the block below it.
• "First fruit in list is" / "Last two fruits in list are" now read "... in the list ...", matching the article's output.
• The last line duplicated the preceding keyword-argument example. Replaced it with the examples the article actually shows next: keyword arguments in an arbitrary order, and positional plus keyword arguments passed as variables.

No requirements.txt change: the article's dependencies field is python==3.14 / minimum-python==3.6 with no third-party packages, and the folder ships nothing for a reader to install from. The python==3.12 -> python==3.14 bump in the article has no pin to mirror here.

person.py and README.md are unchanged; nothing in the update touched them.

How this was verified

• Fresh venv on the article's new pin (uv venv --python 3.14 -> CPython 3.14.6), no third-party installs needed.
• Every script executed under MPLBACKEND=Agg; all three exit 0 and their output matches the corresponding blocks in the updated draft, including the new 1.234_567_89 grouping output and the corrected 6 bananas cost $10.44 line.
• Repo gates with the version the root requirements.txt pins:
  • uvx ruff@0.14.1 format --check python-formatted-output -> 3 files already formatted
  • uvx ruff@0.14.1 check python-formatted-output -> All checks passed!