In Python, you can define functions with optional arguments — that is, arguments that you don’t need to state explicitly afterwards — by providing a default value.

Take advantage of the high-level async functions in Python’s asyncio library to write more efficient Python applications.

In the example above, the calculate_squares function didn’t need any parameters, but what if we wanted to make our log_performance decorator work with any function that takes any parameters?

In Python, the mere act of making a function call incurs a relatively large amount of overhead. If some function is called repeatedly in a tight loop, even if it isn’t a long-running function ...