issubclass() — Expert Examples
Returns True if a class is a subclass of another class
issubclass() performance and internals
Performance characteristics and CPython implementation details.
python
# issubclass() internals import dis def using_issubclass(): pass # Bytecode analysis dis.dis(using_issubclass) # Check if it's truly built-in import builtins print(f"\nissubclass is builtin: {hasattr(builtins, 'issubclass')}") print(f"Type: {type(builtins.issubclass)}")
Understanding the internal implementation helps optimize hot paths in performance-critical code.
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