Data Cleaning Exercises

Dataset pack

Users mixed with test accounts

A user export where QA test accounts are marked with a flag written in several ways.

Fictional data · UTF-8 CSV, every value quoted so padding and leading zeros survive; empty fields are missing values · free for personal and classroom practice · practise it in Exclude test accounts from scope.

users 16 rows × 3 columns

Download users.csv (Pro)

Data dictionary

id
Unique user ID.
email
Email as typed.
is_test
Test-account flag: true/yes/1 or false/no/0 in mixed case.

Values are shown in quotes so leading and trailing spaces are visible. ∅ means the cell is missing. Exercises are also graded on hidden datasets that are never published.