Propy Documentation


This package contains convenience functions for creating class properties with type conversion and validation characteristics in Python. While Python’s lack of typecasting is certainly one of the features that make it an easy to learn and code language, there are certainly times when you might want to implement controls on the types of values a class property can assume. This package provides a few functions to hopefully handle those situations a little easier.

To provide an example, let’s assume you have a property that you want to restrict to boolean values. To do this normally, you would need to setup a property manually by creating custom setter, getter, and deleter functions. With this package, however, you can use the provided bool_property() function instead as follows:

import propy

class Example():
    bool_prop = propy.bool_property('bool_prop')

The bool_property() function creates the setter, getter, and deleter that you would have needed to manually define. The ‘bool_prop’ name supplied to the function is used to create a “private” ‘_bool_prop’ attribute behind the scenes, then the “public” ‘bool_prop’ attribute simply calls the defined setter, getter, and deleter to perform the respective action on that private attribute. It’s not a huge gain, but using this package function reduces to a single line of code what would have typically taken about 10 lines.


This package may be installed via pip:

pip install propy

API Documentation