I tried making an addin having below code where I want the user to press a predefined key and the "required_code" should run on the selected features.

import arcpy
import pythonaddins

class Key1(object):
    """Implementation for Key Listener_addin.Key1 (Button)"""
    def __init__(self):
        self.enabled = True
        self.checked = False
    def onKeyUp(self, keycode, shift):
        print("Process Started")
        print("Key pressed: " + keycode)
        self.checked = True
        #required_code goes here with messagebox
        print("Process Completed")
        self.checked = False

However The above code doesn't do anything, not even printing first line.

How could I enable this addin to run the code on pressing a key? Also how can I print which key is pressed by user?

Could you correct me on what I am doing wrong?


I have tried to define keycode using msvcrt but it is still not working. My updated code is:

import arcpy
import pythonaddins
from msvcrt import getch

class Key1(object):
    """Implementation for Key_Listener_addin.Key1 (Button)"""
    def __init__(self):
        Key1.enabled = True
        Key1.checked = False
        keycode = msvcrt.getch()
    def onClick(self):
        if Key1.checked == True:
            Key1.checked = False
        elif Key1.checked == False:
            Key1.checked = True
    def onKeyUp(self, keycode, shift):
        if Key1.checked == True:
            if keycode == 85:

85 is the ASCII value for 'U'.

1 Answer 1


Use MessageBox instead of print.

def onKeyUp(self, keycode, shift):
    pythonaddins.MessageBox("Process Started", "Process")
    pythonaddins.MessageBox("Key pressed: " + keycode, "Key")
  • Still nothing happen. Nov 12, 2019 at 16:54
  • have I correctly written the onKeyUp() method? Nov 12, 2019 at 16:55
  • Please reply so that I can rectify my code. Nov 18, 2019 at 10:35
  • Why not add a toolbar and button to your addin and have the end user press that button instead of a key on the keyboard to activate your code?
    – F_Kellner
    Nov 20, 2019 at 15:09
  • My requirements need the user to press a key instead of the toolbar button. Dec 4, 2019 at 12:05

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