how computers interpret computer programs and carry out computational processes

some recent progress in computer programs

现在的编程工作更多是调用和组合别人写的轮子，而不像以前那样需要对轮子如何抽象和实现理解得很清楚

• :sp (:split) -> split vim the window horizontally
• :vsp (:vsplit) -> split vim window vertically
• Ctrl + wj -> move cursor to the window below (horizontal split)
• Ctrl + wk -> move cursor to the window below (horizontal split)
• Ctrl + wh -> move cursor to the left window (vertical split)
• Ctrl + wl -> move cursor to the right window (vertical split)

Python provides a kind of "domain language" for thinking about your problem

• Python Data Model, and its API to make our own objects

  • The built-in operators and expressions are at the core of that language and everything else builds from it.

  • we leverage the Python Data Model to build new classes

    • implement special methods when we want out objects to support and interact with fundamental language constructs
    • the Python interpreter invokes special methods to perform basic object operations

• one you build a kind of intuition around python's built-in objects and operations, you will find that your intuition applies everywhere

Object, and Protocols

• everything in Python is first-class
• All objects can be treated as data