Description

This is based on a thread on stackoverflow (the example of C#-like events by Jason Orendorff), so I don’t take any credit for the idea. I merely made a fancy module with documentation and tests out of it, since I needed it in a bigger project. It is quite handy and I’ve been using it in a couple of projects, which require some sort of event handling.

Thus it is licensed as CC0, so basically do-whatever-you-want to the extent legally possible.

Installation

obsub is available on PyPI, so you can simply install it using pip install obsub or you do it manually using setup.py as with any python package.

Usage

The event decorator from the obsub module is used as follows:

from obsub import event

# Define a class with an event
class Subject(object):
    @event
    def on_stuff(self, arg):
        print('Stuff {} happens'.format(arg))

# Now define an event handler, the observer
def handler(subject, arg):
    print('Stuff {} is handled'.format(arg))

# Wire everything up...
sub = Subject()
sub.on_stuff += handler

# And try it!
sub.on_stuff('foo')

You should now get both print messages from the event itself and the event handler function, like so:

Stuff foo happens
Stuff foo is handled

Contribution and feedback

obsub is developed on github.

If you have any questions about this software or encounter bugs, you’re welcome to open a new issue on github.

In case you do not want to use github for some reason, you can alternatively send an email one of us:

• Emilia Bopp

• André-Patrick Bubel

• Thomas Gläßle

Feel free to contribute patches as pull requests as you see fit. Try to be consistent with PEP 8 guidelines as far as possible and test everything. Otherwise, your commit messages should start with a capitalized verb for consistency. Unless your modification is completely trivial, also add a message body to your commit.

Credits

Thanks to Jason Orendorff on for the idea on stackoverflow. I also want to thank @coldfix and @Moredread for contributions and feedback.

Changelog