Lecture Notes on 29 Jan 2014

* Create meaningful short variable names. Use letters to begin your
  variable names and separate two or more words in a variable name
  by underscores.

* Implicit types in Python - numbers, booleans, and strings

* Numbers - integers and floating points numbers. Integer representation
  is exact and so is the arithmetic. Floating point representation is
  inexact and there are round off errors in computations.

* Boolean types are either True or False. 0 (zero) and '' (empty string)
  are also taken to be False. Any other number or string is taken to be
  True.

* String is either in single quotes ('') or double quotes (""). A
  character is a string of unit length. 

* Arithmetic operators: + - * / // % **

* Floor - largest integer less than the number

* Ceiling - smallest integer greater than the number

* Comparison operators: < <= > >= == !=