Generators and comprehensions

A generator is a special kind of iterator in Python. In other words, a Python generator is a function that returns us a generator iterator by issuing the yield command, which can be iterated upon. There might be occasions in which we would want a method or function to return us a series of values, instead of just one. We might, for example, want our method to partially carry out a task, return the partial results to the caller, and then resume the work right from the place where it returned the last value. Usually, when a method terminates or returns a value, its execution begins again from the start. This is what generators try to address. A generator method returns a value and a control to the caller and then continues its execution right from where it left off. A generator method is a normal Python method with a yield statement. The following code...