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One script does everything at once: fetch, clean, and save, and you can't check any single part without running the whole thing.
What you'll have at the end
Your script's logic split into extract, transform, and load functions you can call and check on their own
You need
A script that already runs end to end: it fetches data from somewhere, cleans or reshapes it, and saves the result, all in one unbroken flow with no function marking where one job ends and the next begins.
Not covered
Turning the script into an installable command-line tool with its own flags, or writing a test for every possible bad input: this recipe carries the script's existing logic into three functions and proves each one with one solid, representative test.
Leans on
Save an API's raw reply before parsing anything from it
once fetching is its own function returning the raw reply untouched, saving that raw reply before the cleaning function ever sees it is the natural next step for tracking down a bad record later.
Turn a hardcoded script into a tool your teammate can run
once the three functions exist on their own, exposing the source and destination as command-line arguments only touches the thin block that calls them, never the functions themselves.
Checked 25 Aug 2026
Part of the Python cookbook