debouncedentry.py

from tkinter import ttk

class DebouncedEntry(ttk.Entry):
    def __init__(self, master, delay, callback, validate=None):
        super().__init__(master, validate="key")
        self["validatecommand"] = self.register(self.validate), "%P"

        self.delay = delay
        self.callback = callback
        self.validate = validate
        self.alarm_id = None

    def validate(self, entry):
        if entry and self.validate and not self.validate(entry):
            return False

        if self.alarm_id is not None:
            self.after_cancel(self.alarm_id)
            self.alarm_id = None

        if entry:
            self.alarm_id = self.after(self.delay, self.callback, entry)

        return True