README.md

Lesson 2 - The Basic Elements

Ch3 Running Python

• Several ways to use the python interpreter
  • Interactively
    • Quick testing
    • Exiting
      • exit(), quit(), or ctrl + D
  • Run the code
    • For larger chunks of code
    • python filename.py or python3 filename.py
  • Using an IDE
    • For large projects

Ch4 Objects

• Every entity is an object
  • Every object has
    • A type
    • Some value
• Basic data types
  • Numbers
    • int, float, complex
  • Boolean
    • bool
  • String
    • str
• Use type() to check the type of the object

Ch5 Operators and Expressions

• Arithmetic operators
  • Addition +
  • Subtraction -
  • Multiplication *
  • Division /
  • Floor division //
  • Modulo %
  • Exponential **
• Operator precedence
  • (), **, * // / %, + -
• Overloaded operators
  • Concatenation +
  • Repeat however many times *

Ch6-7 Variables

• Variables is a name or label that points to an object instance in memory
• Assignment statement
  • variable_name = value
• Different variables can point to the same object
• Expressions
  • Produce a value
• Statements
  • Instruction that a computer can execute
  • May not produce a value
• Keywords
  • ..., nonlocal, ...
• Conventions
  • Consists of letters, digits, or underscores
  • Must start with a letter or an underscore
  • Cannot be a reserved keyword
  • Use lowercase + underscores