Python 3.13 Changes -

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.

# Check for removed features checks = [ ("crypt", "Module 'crypt' removed in 3.13"), ("2to3", "Tool removed in 3.13"), ] python 3.13 changes

import sys import time from functools import lru_cache Run with: PYTHON_JIT=1 python script.py def fibonacci(n): """Classic recursive function - JIT helps here""" if n <= 1: return n return fibonacci(n-1) + fibonacci(n-2) Decorators are faster @lru_cache(maxsize=None) def fibonacci_cached(n): if n <= 1: return n return fibonacci_cached(n-1) + fibonacci_cached(n-2) Did you mean: 'defaultdict'

# 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 file_names) for dir_path

# 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"

from dataclasses import dataclass from copy import replace @dataclass class UserConfig: theme: str = "light" notifications: bool = True font_size: int = 12 original = UserConfig() modified = UserConfig(theme="dark", notifications=original.notifications, font_size=original.font_size) New way: clean and declarative original = UserConfig() modified = replace(original, theme="dark", font_size=14)

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.

# Check for removed features checks = [ ("crypt", "Module 'crypt' removed in 3.13"), ("2to3", "Tool removed in 3.13"), ]

import sys import time from functools import lru_cache Run with: PYTHON_JIT=1 python script.py def fibonacci(n): """Classic recursive function - JIT helps here""" if n <= 1: return n return fibonacci(n-1) + fibonacci(n-2) Decorators are faster @lru_cache(maxsize=None) def fibonacci_cached(n): if n <= 1: return n return fibonacci_cached(n-1) + fibonacci_cached(n-2)

# 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

# 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"

from dataclasses import dataclass from copy import replace @dataclass class UserConfig: theme: str = "light" notifications: bool = True font_size: int = 12 original = UserConfig() modified = UserConfig(theme="dark", notifications=original.notifications, font_size=original.font_size) New way: clean and declarative original = UserConfig() modified = replace(original, theme="dark", font_size=14)