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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