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Project Description

Overview Video

An overview of Properties, November 2016.

Why

Giving structure (and documentation!) to the properties you use in your classes avoids confusion and allows users to interact flexibly and provide multiple styles of input, have those inputs validated, and allow you as a developer to set expectations for what you want to work with.

Scope

The properties package allows you to create strongly typed objects in a consistent way. This allows you to hook into notifications and other libraries.

Goals

  • Keep a clean name space so that it can be used easily by users
  • Prioritize documentation
  • Connect to other libraries for interactive visualizations

Documentation

API Documentation is available at ReadTheDocs.

Alternatives

  • traits is used by Enthought
  • traitlets is used in the Jupyter project
  • mypy and PEP0484 which document typing but do not include coercion or notifications

Connections

  • SimPEG Simulation and Parameter Estimation in Geophysics

Installation

To install the repository, ensure that you have pip installed and run:

pip install properties

For the development version:

git clone https://github.com/3ptscience/properties.git
cd properties
pip install -e .

Examples

Lets start by making a class to organize your coffee habits.

import properties
class CoffeeProfile(properties.HasProperties):
    name = properties.String('What should I call you?')
    count = properties.Integer(
        'How many coffees have you had today?',
        default=0
    )
    had_enough_coffee = properties.Bool(
        'Have you had enough coffee today?',
        default=False
    )
    caffeine_choice = properties.StringChoice(
        'How do you take your caffeine?' ,
        choices=['coffee', 'tea', 'latte', 'cappuccino', 'something fancy'],
        required=False
    )

The CoffeeProfile class has 4 properties, all of which are documented! These can be set on class instantiation:

profile = CoffeeProfile(name='Bob')
print(profile.name)

Out [1]: Bob

Since a default value was provided for had_enough_coffee, the response is (naturally)

print(profile.had_enough_coffee)

Out [2]: False

We can set Bob’s caffeine_choice to one of the available choices; he likes coffee

profile.caffeine_choice = 'coffee'

Also, Bob is half way through his fourth cup of coffee today:

profile.count = 3.5

Out [3]: ValueError: The 'count' property of a CoffeeProfile instance must
         be an integer.

Ok, Bob, chug that coffee:

profile.count = 4

Now that Bob’s CoffeeProfile is established, properties can check that it is valid:

profile.validate()

Out [4]: True

Property Classes are auto-documented in Sphinx-style reStructuredText! When you ask for the doc string of CoffeeProfile, you get

**Required Properties:**

* **count** (:class:`Integer <properties.basic.Integer>`): How many coffees have you had today?, an integer, Default: 0
* **had_enough_coffee** (:class:`Bool <properties.basic.Bool>`): Have you had enough coffee today?, a boolean, Default: False
* **name** (:class:`String <properties.basic.String>`): What should I call you?, a unicode string

**Optional Properties:**

* **caffeine_choice** (:class:`StringChoice <properties.basic.StringChoice>`): How do you take your caffeine?, any of "coffee", "tea", "latte", "cappuccino", "something fancy"
Release History

Release History

0.3.3

This version

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0.3.1

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0.3.1b1

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0.3.1b0

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0.3.0

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0.3.0b1

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0.3.0b0

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0.2.3

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0.2.1

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0.2.0

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0.1.5

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0.1.4

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0.1.3

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0.1.1

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0.0.1

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Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
properties-0.3.3.tar.gz (36.6 kB) Copy SHA256 Checksum SHA256 Source Mar 23, 2017

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