Uploaded February 2023 | Updated September 2026, 3 days ago

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This video will walk you through Amazon's 'Three Purchases' Python interview question solution.
We'll demonstrate how to apply a Lambda filter function based on a specific calculation, such as retrieving only orders for the year when a user has placed at least three orders. We'll explain how to tweak the Lambda function to return true or false values based on the number of rows in the group. With this knowledge, you can easily extract data subsets that meet your criteria.


🧑‍💻 Go to the question through the link below and follow along with me:
platform.stratascratch.com/coding/2095-three-purchases?code_type=2&utm_source=youtube&utm_medium=click&utm_campaign=YT+lambda+filter

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👉 Playlist for more data science interview questions and answers: bit.ly/3jifw81
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👉 Practice more real data science interview questions: platform.stratascratch.com/coding?utm_source=youtube&utm_medium=click&utm_campaign=YT+lambda+filter

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Timeline:

Intro: (0:00​​​)
Interview Question: (0:47)
Exploring and understanding the dataset: (1:03)
Coding the solution: (2:36​​)
Conclusion: (​9:15)

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About The Platform:

I'm using StrataScratch (platform.stratascratch.com/coding?utm_source=youtube&utm_medium=click&utm_campaign=YT+lambda+filter), a platform that allows you to practice real data science interview questions. There are over 1000+ interview questions that cover coding (SQL and python), statistics, probability, product sense, and business cases.

So, if you want more interview practice with real data science interview questions, visit platform.stratascratch.com/coding?utm_source=youtube&utm_medium=click&utm_campaign=YT+lambda+filter. All questions are free and you can even execute SQL and python code in the IDE, but if you want to check out the solutions from me or from other users, you can use ss15 for a 15% discount on the premium plans.

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Contact:

If you have any questions, comments, or feedback, please leave them here!
Feel free to also email me at nathan@stratascratch.com

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#AmazonCodingInterview #PythonInterviewQuestion #LambdaPython