Skip to content

Latest commit

 

History

History
128 lines (81 loc) · 2.14 KB

20190505_plugins.md

File metadata and controls

128 lines (81 loc) · 2.14 KB

%title: Plug-ins: Adding Flexibility to Your Apps %author: PyCon 2019 @gahjelle %date: May 5, 2019

-> # Geir Arne Hjelle <-

Agenda

  • Motivation

  • Example: Plotter app

    • Different data formats
    • Choosing what to plot
    • More plotting styles

  • Plug-ins

Motivation

Modularized code:

  • is less complex ^
  • is easier to maintain and test ^
  • is easier to extend ^

With plug-ins, your app:

  • can be controlled by configuration settings ^
  • can be extended and customized for and by users ^
  • can be better structured, and developed faster

Demo time

We'll build a simple plotter app: ^

  • Command line application
  • Read data from a CSV file
  • Plot data in a simple line graph

Decorators

A decorator is a function that wraps another function:

 decorated = decorator(original)

  • Decorators are typically used to add some common functionality across many functions or methods ^

  • In most cases, decorators are applied using @-syntax:

    @click.command() def main(file_path): ... ^

-> realpython.com/primer-on-python-decorators <-

Demo time

^

Let's expand our plotter app: ^

  • Support more file formats, like JSON
  • Support more kinds of plots
  • Control which data to plot

PyPlugs

A simple decorator based plug-in architecture for Python

 
 $ pip install pyplugs

Three levels:

  • Plug-in packages: Directories containing files with plug-ins
  • Plug-ins: Modules containing registered functions or classes
  • Plug-in funcs: Several registered functions in the same file

PyPlugs

Example use cases for plug-ins:

  • Readers for different file formats
  • Models for flexible calculations
  • Filters for filtering your data
  • Writers for storing your data in different formats
  • Notifiers for sending you data to different devices
  • Components for building your GUI

-> # Thank You For Your Attention <-

^

-> - Me: @gahjelle <- -> - Code: github.com/gahjelle/talks <- -> - PyPlugs: pyplugs.readthedocs.io <- -> - Real Python: realpython.com <-