Web Reference: Jul 16, 2009 · Using mutable values passed in as arguments as local temporaries is an extremely bad idea, whether we're in Python or not and whether there are default arguments involved or not. Python’s default arguments are evaluated once when the function is defined, not each time the function is called (like it is in say, Ruby). This means that if you use a mutable default argument and mutate it, you will and have mutated that object for all future calls to the function as well. Sep 18, 2025 · So the next time you see a linter warn you about a "mutable default argument," you'll know exactly what it means and how to fix it. You haven't just fixed a bug; you've mastered one of Python's most famous nuances.
YouTube Excerpt: In this
Information Profile Overview
Weird Python Mutable Default Arguments - Latest Information & Updates 2026 Information & Biography
Details: $80M - $104M
Salary & Income Sources
Career Highlights & Achievements
Assets, Properties & Investments
This section covers known assets, real estate holdings, luxury vehicles, and investment portfolios. Data is compiled from public records, financial disclosures, and verified media reports.
Last Updated: April 3, 2026
Information Outlook & Future Earnings
Disclaimer: Disclaimer: Information provided here is based on publicly available data, media reports, and online sources. Actual details may vary.