Extracting a substring in Python using slicing can be achieved with negative indexing. 1️⃣ Negative indices count from the end of the string. For example, s[-1] gives the last character.

The count() is one of those generic python programming methods which return binary value as output. This method searches for the occurrence of a substring inside a string and returns 1 if substring is ...

Let's define a function countUniqueChars(s) that returns the number of unique characters on s. For example, calling countUniqueChars(s) if s = "LEETCODE" then "L", "T ...