id() — Expert Examples

Returns the unique identity (memory address) of an object

EasyIntermediateAdvancedExpert

id() performance and internals

Performance characteristics and CPython implementation details.

python
# id() internals
import dis

def using_id():
    pass

# Bytecode analysis
dis.dis(using_id)

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

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

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