Web Reference: Dec 19, 2025 · However, even experienced developers occasionally encounter errors when using `sum ()`, especially the perplexing `TypeError: 'int' object is not callable`. In this blog, we’ll demystify this error, explore why it occurs, and provide a step-by-step guide to fixing it. Aug 2, 2021 · You're facing an error because the sum() function expects an iterable object (example: lists) while you're passing in integer values. Try running sum(1,2) and notice that the same error shows up, while running sum([1,2]) will work fine. You can now use Python’s built-in function sum() to add multiple numeric values together. This function provides an efficient, readable, and Pythonic way to solve summation problems in your code.
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