Python 3.13 Changes ((exclusive)) Review

# Python 3.13 introduces __main__.py improvements if name == " main ": main() You can now use (in main .py): def main(): print("Running as main module") Python 3.13 automatically detects and runs main() in main .py No need for the if name guard in entry point modules 8. Security Enhancements import hashlib import ssl SHA-3 is now fully integrated and optimized def hash_demo(): data = b"Sensitive information"

src.write_text("Hello, Python 3.13!") # Copy with metadata preservation src.copy(dst, preserve_metadata=True) print(f"Copied: dst.read_text()") # Move (replaces shutil.move) new_location = Path(tmpdir) / "moved.txt" src.move(new_location) print(f"Source exists: src.exists()") # False print(f"Moved to: new_location.read_text()") Better type narrowing and more precise type checking. python 3.13 changes

# Better import error suggestions try: from collections import defaultdictt # Typo! except ImportError as e: print(e) # "cannot import name 'defaultdictt' from 'collections'. Did you mean: 'defaultdict'?" class DataProcessor: def process_data(self): pass # Python 3

# Create test structure (root / "subdir1").mkdir() (root / "subdir2").mkdir() (root / "subdir1" / "file1.txt").write_text("content1") (root / "subdir2" / "file2.py").write_text("print('hello')") # New walk() yields (dir_path, dir_names, file_names) for dir_path, dir_names, file_names in root.walk(): print(f"Directory: dir_path.name") print(f" Subdirs: dir_names") print(f" Files: file_names") # New match() with better pattern support py_files = [p for p in root.rglob("*.py")] print(f"Python files: py_files") New Path.copy() and Path.move() methods def demonstrate_copy_move(): with tempfile.TemporaryDirectory() as tmpdir: src = Path(tmpdir) / "source.txt" dst = Path(tmpdir) / "dest.txt" except ImportError as e: print(e) # "cannot import