Python Shell Session - List Comprehensions

Python Shell Session on List Comprehensions. Getting the square of numbers, word length of words, binary digits of numbers and even numbers. Formatting large numbers with a comma, but can be customised (e.g. hyphen instead of comma). 3,454 would be customised as 3-454. Use of join Method to Convert a list into a string. Use of built-in function sum to get the sum of the numbers.