round() — Expert Examples

Rounds a number to a given number of decimal places

EasyIntermediateAdvancedExpert

round() performance and internals

Performance characteristics and CPython implementation details.

python
# round() internals
import dis

def using_round():
    pass

# Bytecode analysis
dis.dis(using_round)

# Check if it's truly built-in
import builtins
print(f"\nround is builtin: {hasattr(builtins, 'round')}")
print(f"Type: {type(builtins.round)}")

Understanding the internal implementation helps optimize hot paths in performance-critical code.

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