Listing accessible event devices¶
>>> import evdev >>> devices = [evdev.InputDevice(path) for path in evdev.list_devices()] >>> for device in devices: ... print(device.path, device.name, device.phys) /dev/input/event1 USB Keyboard usb-0000:00:12.1-2/input0 /dev/input/event0 USB Optical Mouse usb-0000:00:12.0-2/input0
If you do not see any devices, ensure that your user is in the
correct group (typically
input) to have read/write access.
Reading events from a device¶
>>> import evdev >>> device = evdev.InputDevice('/dev/input/event1') >>> print(device) device /dev/input/event1, name "USB Keyboard", phys "usb-0000:00:12.1-2/input0" >>> for event in device.read_loop(): ... if event.type == evdev.ecodes.EV_KEY: ... print(evdev.categorize(event)) ... # pressing 'a' and holding 'space' key event at 1337016188.396030, 30 (KEY_A), down key event at 1337016188.492033, 30 (KEY_A), up key event at 1337016189.772129, 57 (KEY_SPACE), down key event at 1337016190.275396, 57 (KEY_SPACE), hold key event at 1337016190.284160, 57 (KEY_SPACE), up
Accessing event codes¶
evdev.ecodes module provides reverse and forward mappings between the
names and values of the event subsystem constants.
>>> from evdev import ecodes >>> ecodes.KEY_A ... 30 >>> ecodes.ecodes['KEY_A'] ... 30 >>> ecodes.KEY ... 'KEY_A' >>> ecodes.bytype[ecodes.EV_KEY] ... 'KEY_A' # A single value may correspond to multiple event codes. >>> ecodes.KEY ... ['KEY_COFFEE', 'KEY_SCREENLOCK']
Listing and monitoring input devices¶
The python-evdev package also comes with a small command-line program for listing and monitoring input devices:
$ python -m evdev.evtest