hasattr() — Expert Examples

Returns True if an object has the given named attribute

EasyIntermediateAdvancedExpert

hasattr() performance and internals

Performance characteristics and CPython implementation details.

python
# hasattr() internals
import dis

def using_hasattr():
    pass

# Bytecode analysis
dis.dis(using_hasattr)

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

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

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