Manipulate data efficiently in Python

Q: Manipulate data efficiently in Python

This is a Data Manipulation (SQL/Python) interview question from Other for Data Scientist roles. View the full question and solution on PracHub.

Q: How do I approach Data Manipulation (SQL/Python) interview questions?

Data Manipulation (SQL/Python) questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master data manipulation (sql/python) interviews.

Question

Answer the following: (a) Contrast list comprehensions and generators with respect to memory and evaluation; write a generator that yields rolling windows of size k over a list. (b) In CPython 3.x, what is the maximum integer value and why? (c) Demonstrate a bug caused by Python’s pass-by-object-reference when mutating a list argument inside a function; fix it. (d) Given a pandas DataFrame of the events table (columns: user_id, event_date, event_type, revenue), compute per-country 7-day conversion on 2025-09-01 and total revenue using idiomatic groupby and boolean indexing; avoid apply for row-wise operations.

Manipulate data efficiently in Python

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