sum() — Expert Examples
Returns the total of all items in an iterable
sum() performance and internals
Performance characteristics and CPython implementation details.
python
# sum() internals import dis def using_sum(): pass # Bytecode analysis dis.dis(using_sum) # Check if it's truly built-in import builtins print(f"\nsum is builtin: {hasattr(builtins, 'sum')}") print(f"Type: {type(builtins.sum)}")
Understanding the internal implementation helps optimize hot paths in performance-critical code.
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