EasyAbout 8 minString cleaning
Extract a clean email domain
An email column is messy — stray surrounding whitespace and inconsistent casing. Return each email's domain (the part after @), trimmed and lowercased, as a Python list in row order.
What the tests check
2 on Run · 3 on Submit01domain trimmed and lowercased
02handles already-clean input
Submit runs these and one more check you don’t see, so code written for the visible tests alone can still miss.
Runtime
Python 3.13 in your browser – the standard library plus pandas and numpy; no pip installs.