gemma-py

gemma is is a python library for mapping data structures, named for Dutch cartographer Gemma Frisius. From Wikipedia:

Gemma Frisius (/ˈfrɪziəs/; born Jemme Reinerszoon; December 9, 1508 – May 25, 1555),
was a Dutch physician, mathematician, cartographer, philosopher, and instrument
maker. He created important globes, improved the mathematical instruments of his day
and applied mathematics in new ways to surveying and navigation.

Contents:

• Basic Usage
• Example Objects
  • simple
  • data_dict
  • data_list
  • structured
  • target
• Bearings: Access Data Generically
  • BearingAbstract Base Type
  • Bearing Shorthand
  • Implementations
    • Attr Type
    • Item Type
    • Call Type
    • Fallback Type
  • Casting Bearings
  • Sorting Bearings
  • Checking Bearing Equality
  • Bearing Factory Method
• Courses: Data as Paths
  • Course Class
  • Making a New Course Object
  • Appending Courses
  • The PORT Course
  • Course Length
  • Iterating Through a Course
  • Course Equality
  • Slicing and Indexing
  • Checking for a Sub-Course or Bearing
  • Fetching Default Values
  • Creating Missing Bearings
  • More fetch() Examples
• Compasses: Describe Objects
  • Compass Class
  • Map Bearings of Object
  • Include Methods of Object
  • Omitting Bearings from Map
  • Restrict Bearings from Map
  • Declare Compatible Types
  • Custom Compatibility
  • Additional Examples
• Surveyors: Traverse Structures
  • Surveyor Class
  • Get all Courses in Object
  • Charting with Custom Compasses
  • Adding Additional End Points
  • Suppressing NonNavigableError
• Cartographers: Move Data
  • Coordinate Dataclass
  • Coord Alias
  • Cartographer Class
  • Mapping Flow
  • Features
  • Basic Mapping
  • Using Default Values
  • Supply Cleaning Functions
  • Blank Destinations
  • Map Source Automatically
  • Mix Explicit and Automatic Mapping
  • Override Default Methods
  • One/Many Origins to One/Many Destinations
  • Suppress Errors
• Exceptions
• Extension: XML
  • XElm Bearing Type
  • XCourse
  • XCompass
  • xsurveyor
  • Cartography
• Extending gemma