Fun programming practice problems to help you learn 
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16 problems | 3 articles
Sharpen your version control skills for collaborating with other developers
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google-bigquery google-cloud sql
12 problems | 4 articles
Learn how to create tables, ingest data, and write SQL queries to manipulate and fetch BIG data
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7 problems | 3 articles
We've got data and we've got plots. Can you match our work?
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machine-learning evaluation-metrics loss-functions distance-metrics correlation-metrics
7 problems | 4 articles
Enhance your ML toolbelt with evaluation metrics, loss functions, distance metrics, and correlation metrics
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4 problems | 2 articles
Write robust unit tests in python with pytest. Can you defend against our garbage input?
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25 problems | 6 articles
Practice manipulating arrays and data with these NumPy challenges.
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22 problems | 4 articles
Master the art of wrangling data with Pandas Series and DataFrames.
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python numpy scipy sparse-matrix distance-metrics
5 problems | 1 article
What's more fun than matrices? Sparse matrices. Learn how to use them in Python with these practice problems.
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machine-learning python pytorch
5 problems | 2 articles
Build AI systems that learn from data .
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2 problems | 1 article
How well do you know Redis data structures?
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18 problems | 4 articles
Learn how to manipulate strings in Python using regular expressions.
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6 problems | 2 articles
Build automated browsers that interact with our Selenium Playground .