Hands-On Reactive Programming with Python

The take_last operator

The take_last operator returns only the n last items emitted by the source observable. The following figure shows the marble diagram of this operator:

Figure 9.7: The take_last operator

The prototype of this operator is the following:

take_last(self, count)

Here, count is the number of items to keep from the source observable.

Here is an example of this operator:

numbers = Observable.from_([1, 2, 3, 4, 5, 6])numbers.take_last(2).subscribe(    on_next = lambda i: print("on_next {}".format(i)),    on_error = lambda e: print("on_error: {}".format(e)),    on_completed = lambda: print("on_completed"))

This gives the following result: ...