Python 3.13 Changes 〈FHD〉

# List comprehension performance list_time = timeit.timeit( "[i * 2 for i in range(1000)]", number=100000 ) print(f"List comprehensions: list_time:.3fs")

def process_data(data: list[str] | list[int]): if is_string_list(data): # Type checker knows data is list[str] here print(f"String list: ', '.join(data)") else: # Type checker knows data is list[int] here print(f"Sum of ints: sum(data)") def handle_status(status: Literal["active", "inactive", "pending"]) -> str: match status: case "active": return "User is active" case "inactive": return "User is inactive" case "pending": return "User pending approval" case _: assert_never(status) # Type checker verifies all cases handled 6. Performance Improvements Python 3.13 includes a new JIT compiler (experimental) and optimized internals. python 3.13 changes

def check_compatibility(): """Run this to identify potential issues""" # List comprehension performance list_time = timeit