exec() — Expert Examples

Executes a string or code object as Python statements

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exec() performance and internals

Performance characteristics and CPython implementation details.

python
# exec() internals
import dis

def using_exec():
    pass

# Bytecode analysis
dis.dis(using_exec)

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

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

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