Find the Bug A Book of Incorrect Programs

Find a Substring

This function finds a substring within a string. It returns a tuple with two elements:

• The first element is the part of the outer string before the substring.

• The second element is the rest of the outer string (beginning with the substring).

If the substring is not found, the first element of the tuple is the entire original string and the second element is an empty string.

Note

The standard Python string library has a function, find(), that does essentially the same operation. (It returns the index of the first occurrence of the substring, not a tuple.) This book doesn't use that here.

Source Code

						1. def findSubstring ( outerString, ...