Numpy Array Indexing and Selection Now that we know how to build arrays, let's look at how to pull values our of an array using indexing, and also slicing off sections of an array. Indexing This is ...

This makes sure that s [:i] + s [i:] is always equal to s. Slice indices have useful defaults; an omitted first index defaults to zero, an omitted second index defaults to the size of the string being ...