canon-remote is a USB library for Canon digital cameras in Python with pyusb. It originally started as a Python port of gphoto2's Canon library for a PowerShot G3. Only the subset necessary for this model was ported, but it should be usable with other models from that era (not without hacking) and will almost surely not work on much newer cameras, not without serious hacking. The project was created because gphoto2 lacks support for certain remote capture features, namely locking the autofocus and setting the autofocus mode to macro.
The latest project documentation can be found at the project homepage. Or you can build it from source.
· Use this at your own risk. I haven't damaged my camera with it yet, but it's not impossible.