All functions return a value when called. If a return statement is followed by an expression list, that expression list is evaluated and the value is returned: ...

To memoize a function in Python, we can use a utility supplied ... with Python’s interpreter at a low level. Any calls that return a result from the cache don’t even generate a new stack ...

Many developers do use some kind of dependency injection in Python ... It will return Success[YourType] or Failure[Exception]. And will never throw exception at us! We also use flow and bind functions ...