dir() — Expert Playground

Lists the names (attributes and methods) of an object or current scope

Python Playground

# dir() internals
import dis

def using_dir():
    pass

# Bytecode analysis
dis.dis(using_dir)

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

Output

Click "Run" to execute your code

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

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

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