Web Reference: Feb 27, 2026 · "Because you defined the default as a mutable list [], Python creates that list once and stores it inside the function object itself. Every time you call the function without providing a list of your own, you are pointing back to that same, original object." Feb 26, 2026 · "Because you defined the default as a mutable list [], Python creates that list once and stores it inside the function object itself. Every time you call the function without providing a list of your own, you are pointing back to that same, original object." Jul 16, 2009 · How many Python beginners have passed a list to a function that modified it, and were shocked to see the changes show up in the original variable? Yet mutable object types are wonderful, when you understand how to use them. I guess it just boils down to opinion on this particular pitfall.
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Python List Trap Why This Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $52M - $68M
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Last Updated: April 2, 2026
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