KeyNet

KeyNet is a simple and powerful Python library for detecting keyboard events (key press, key release) and binding them to custom callbacks.

With KeyNet, you can easily build keyboard-based automation, hotkey triggers, or even interactive applications that react instantly when a key is pressed.

Features

• Detect key press and key release events
• Simple .on(event, callback) API
• Runs in a background thread, so your main app keeps working
• Works out-of-the-box on Windows
• Useful for automation, scripting, and productivity apps

Installation

You can install keynet by:

pip install keynet

Usage/Examples

Example 1 – Detect a single key

from keynet import KeyNet

kn = KeyNet()

def log_key(key):
    print(f"[KeyLog] {key}")

kn.on("key_press", log_key)
kn.start()

input("Logging keys... Press Enter to quit\n")

Example 2 hotkey actions

from keynet import KeyNet

kn = KeyNet()

def key_action(key):
    if key == "a":
        print("You pressed A → Triggering Action 1")
    elif key == "b":
        print("You pressed B → Triggering Action 2")
    elif key == "q":
        print("Quit hotkeys (press Enter to exit)")
        kn.stop()

kn.on("key_press", key_action)
kn.start()

input("Try pressing A, B, or Q\n")

Example 3 volume control

from keynet import KeyNet
from ctypes import cast, POINTER
from comtypes import CLSCTX_ALL
from pycaw.pycaw import AudioUtilities, IAudioEndpointVolume

devices = AudioUtilities.GetSpeakers()
interface = devices.Activate(IAudioEndpointVolume._iid_, CLSCTX_ALL, None)
volume = cast(interface, POINTER(IAudioEndpointVolume))

kn = KeyNet()

def volume_control(key):
    if key == "up":
        current = volume.GetMasterVolumeLevelScalar()
        volume.SetMasterVolumeLevelScalar(min(1.0, current + 0.1), None)
        print(f"Volume UP → {int(volume.GetMasterVolumeLevelScalar() * 100)}%")
    elif key == "down":
        current = volume.GetMasterVolumeLevelScalar()
        volume.SetMasterVolumeLevelScalar(max(0.0, current - 0.1), None)
        print(f"Volume DOWN → {int(volume.GetMasterVolumeLevelScalar() * 100)}%")

kn.on("key_press", volume_control)
kn.start()

input("Press UP/DOWN arrow keys to control volume (Enter to quit)\n")

Example 4 - mouse position

from keynet import KeyNet
from pynput import mouse

kn = KeyNet()
mouse_controller = mouse.Controller()

def key_mouse_combo(key):
    if key == "c":
        pos = mouse_controller.position
        print(f"Captured mouse position: {pos}")
    elif key == "r":
        mouse_controller.position = (100, 100)
        print("Moved mouse to (100, 100)")

kn.on("key_press", key_mouse_combo)
kn.start()

input("Press C to capture mouse pos, R to move mouse (Enter to quit)\n")

API Reference

KeyNet Class

KeyNet()

Create a new event detector instance.

---

Keyboard Event Handlers

@detector.on_key(callback)

Registers a callback that triggers on every key press.

@detector.on_key
def log_key(event):
    print(f"Key pressed: {event}")

@detector.on_hotkey(hotkeys: List[Set[str]])

Registers a callback that triggers when a hotkey combination is pressed.

@detector.on_hotkey([{"ctrl", "shift", "x"}])
def hotkey_action(event):
    print("CTRL + SHIFT + X detected!")

---

Mouse Event Handlers

@detector.on_click(callback)
Registers a callback for mouse clicks.

@detector.on_click
def on_click(event):
    print(f"Mouse clicked: {event}")

@detector.on_scroll(callback)
Registers a callback for mouse scroll events.

@detector.on_scroll
def on_scroll(event):
    print(f"Scrolled: {event}")

---

System Event Handlers

@detector.on_volume_change(callback)
Registers a callback for system volume changes.

@detector.on_volume_change
def on_volume_change(volume_level):
    print(f"Volume changed: {volume_level}")

---

Running the Detector

detector.start()
Starts listening for all registered events.

detector.start()

detector.stop()
Stops event detection.

detector.stop()

License

MIT

Authors

• @Rudransh joshi