Daniel Arbuckle's Mastering Python

The Observable.select_many method

Next is Observable.select_many. This time, let's take a look at what Python's help function can show us, using following command:

help(rx.Observable.select_many)  

This should give you the following description:

This observable factory method is a more generalized version of select. Here, select applies a function to each member of the sequence to create a new sequence from the function return values, and select_many expects a function that returns an observable sequence and concatenates those sequences.

This means that the function applied by select_many can remove elements from the sequence by returning ...