Python 3.13 Changes -

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)")

Python 3.13 includes a new JIT compiler (experimental) and optimized internals. python 3.13 changes

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 python 3.13 changes

.py

: A new Just-In-Time (JIT) compiler has been integrated into the core. It translates Python bytecode into machine code on the fly to boost performance. python 3.13 changes