Operators and Readability

Python provides operators for mathematical calculations. Most work exactly like you'd expect from math class, but a few have special behaviors. Special Operators Python has three additional arithmetic operators that are incredibly useful: Floor division for whole numbers: 125 minutes = 2 complete hours. 45 items = 4 complete pages of 10. Modulo for remainders: Order of Operations Python follows the standard mathematical order of operations (PEMDAS): Parentheses, Exponents, Multiplication/Division, Addition/Subtraction. Result is 14, not 20. Multiplication happens first (3 * 4 = 12), then addition (2 + 12 = 14). When in doubt, use parentheses for clarity. Comments and Readable Code Comments are notes in your code that Python completely ignores. They exist only for humans reading the code. W

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This section is part of the Python Expressions: Beginner lesson on DataDriven, a free data engineering interview prep platform. Each section includes explanations, worked examples, and hands-on code challenges that execute in real time. SQL queries run against a live PostgreSQL database. Python runs in a sandboxed Docker container. Data modeling problems validate against interactive schema canvases. All content is framed around what data engineering interviewers actually test at companies like Meta, Google, Amazon, Netflix, Stripe, and Databricks.

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