how to check if letter is in code example

Example 1: how to check if a char is a letter java

Character.isDigit(string.charAt(index)) //(JavaDoc) will return true if it's a digit
Character.isLetter(string.charAt(index)) //(JavaDoc) will return true if it's a letter

Example 2: python check if character is letter

>>> 'A'.isalpha()
True
>>> '1'.isalpha()
False