Lecture Notes on 11 Jan 2023

* What is good software design?
  - correct
  - efficient: time and space
  - readable / understandable
  - maintainable
  - robust / stable
  - scalable
  - aesthetically pleasing
  - user friendly

* Write the Hello World program
  def main():
    print ("Hello World!")
  main()

* Characterset: ASCII / Unicode

* Variables: 
  - must begin with a letter or underscore
  - can be followed by zero or more letters, digits, and underscores
  - cannot be a reserved word

* Types - int, float, str, bool

* Simple assignment statements

* Operators
  - arithmetic: + - * / // % **
  - comparison: < <= > >= == !=
  - boolean: not, and, or
  - bitwise: ~, &, |, ^
  - shift: << >>