Qhue (pronounced 'Q') is an exceedingly thin Python wrapper for the Philips Hue API.
I wrote it because some of the other (excellent) frameworks out there weren't quite keeping up with developments in the API. Because Qhue encodes almost none of the underlying models - it's really just a way of constructing URLs and HTTP calls - it should inherit any new API features automatically. The aim of Qhue is not to create another Python API for the Hue system, so much as to turn the existing API into Python, with minimal interference.
Philips, to their credit, created a beautiful RESTful API for the Hue system. It may not yet have all the features we'd like, but what does exist is very elegantly designed.
You can (and should) read the full documentation here, but a quick summary is that resources like lights, scenes and so forth each have a URL, that might look like this:
http://[myhub]/api/<username>/lights/1
You can read information about light 1 by doing an HTTP GET of this URL, and modify it by doing an HTTP PUT.
In the qhue module we have a Resource class, which represents something that has a URL. By calling an instance of this class, you'll make an HTTP request to the hub on that URL.
It also has a Bridge class, which is a handy starting point for building Resources (and is itself a Resource). If that seems a bit abstract, don't worry - all will be made clear below.
That's easy.
pip install qhue
You may want to check GitHub for the very latest version.
Note: These examples assume you know the IP address of your bridge. See the 'Getting Started' section of the API docs if you need help in finding it. I've assigned mine a static address of 192.168.0.45, so that's what you'll see below.
They also assume you have experimented with the API before, and so have a user account set up on the bridge, and the username stored somewhere. If not, see the section below entitled 'Creating a user'.
OK. Now those preliminaries are out of the way...
First, let's create a Bridge, which will be your top-level Resource.
# Connect to the bridge with a particular username
from qhue import Bridge
b = Bridge("192.168.0.45", username)
You can see the URL of any Resource:
# This should give you something familiar from the API docs:
print b.url
By requesting most other attributes of a Resource object, you will construct a new Resource with the attribute name added to the URL of the original one:
lights = b.lights # Creates a new Resource with its own URL
print lights.url # Should have '/lights' on the end
These Resources are, at this stage, simply references to entities on the bridge. To make an actual API call to the bridge, we simply call the Resource as if it were a function:
# Let's actually call the API and print the results
print lights()
Qhue takes the JSON that is returned by the API and turns it back into Python objects, typically a dictionary, so you can access its parts easily:
# Get the bridge's configuration info as a dict,
# and print the ethernet MAC address
print b.config()['mac']
Now, ideally, we'd like to be able to construct all of our URLs the same way, so we'd refer to light 1 as b.lights.1, but you can't use numbers as attribute names. Nor can you use variables. As an alternative, therefore, you can use dictionary key syntax - for example, b.lights[1].
# Get information about light 1
print b.lights[1]()
# or, to do the same thing another way:
print b['lights'][1]()
Alternatively, when you call a resource, you can give it arguments, which will be added to its URL when making the call:
# This is the same as the last examples:
print b('lights', 1)
So there are several ways to express the same thing, and you can choose the one which fits most elegantly into your code.
Now, to make a change to a value, you also call the resource, but using a keyword argument. You can change the brightness and hue of a light by setting properties on its state, for example:
b.lights[1].state(bri=128, hue=9000)
and you can mix URL-constructing positional arguments with value-setting keyword arguments, if you like:
# Positional arguments are added to the URL.
# Keyword arguments change values.
# So these are equivalent to the previous example:
b.lights(1, 'state', bri=128, hue=9000)
b('lights', 1, 'state', bri=128, hue=9000)
This covers most simple cases. If you don't have any keyword arguments, the HTTP request will be a GET. If you do, it will be a PUT.
Sometimes, though, you need to specify a POST or a DELETE, and you can do so with the special http_method argument, which will override the above rule:
# Delete rule 1
b('rules', 1, http_method='delete')
Finally, for certain operations, like schedules and rules, you'll want to know the 'address' of a resource, which is the absolute URL path - the bit after the IP address. You can get that with the address attribute:
>>> b.groups[1].url
'http://192.168.0.45/api/ac594202624a7211ac44615430a461/groups/1'
>>> b.groups[1].address
'/api/ac594202624a7211ac44615430a461/groups/1'
And, at present, that's about it.
If you haven't used the API before, you'll need to create a user account on the bridge.
from qhue import create_new_username
username = create_new_username("192.168.0.45")
You'll get a prompt saying that the link button on the bridge needs to be pressed. Go and press it, and you should get a generated username. You can now get a new Bridge object as shown in the examples above, passing this username as the second argument.
Please have a look at the examples directory for a method to store the username for future sessions.
Please note that qhue won't do any local checking of any method calls or arguments - it just packages up what you give it and sends it to the bridge.
An important example of this is that the bridge is expecting integer values for things like colour temperature and brightness. If, say, you do a calculation for your colour which returns a float, you need to convert that to an int before sending or it will be ignored. (Sending a string returns an error, but sending a float does not.)
This works under Python 2 and Python 3. It uses Kenneth Reitz's excellent requests module, so you'll need to do:
pip install requests
or something similar before using Qhue. If you installed Qhue itself using pip, this shouldn't be necessary.
This little snippet is distributed under the GPL v2. See the LICENSE file. (They spell it that way on the other side of the pond.) It comes with no warranties, express or implied, but just with the hope that it may be useful to someone.
Suggestions, patches, pull requests welcome. There are many ways this could be improved.
If you can do so in a general way, without adding too many lines, that would be even better! Brevity, as Polonius said, is the soul of wit.
Many thanks to Chris Macklin, Andrea Jemmett, Martin Paulus, Ryan Turner, Matthew Clapp, Marcus Klaas de Vries and Richard Morrison, amongst others, for their contributions!