python tkinter文本框绑定回车键入后会自动生成空段

我的问题是键入回车后文本框会自动生成一个空段
源码如下：

import tkinter as tk
import tkinter.messagebox
import threading
import time
import pygame
import os
from tkinter import ttk

def add_schedule(event=None):
    schedule = text.get("1.0", "end-1c").strip()
    text.delete("1.0", "end")
    listbox.insert("end", schedule)
    alarm_time = schedule.split()[0]
    alarm_thread = threading.Thread(target=alarm, args=(alarm_time, schedule))
    alarm_thread.start()
    alarm_threads.append(alarm_thread)
    with open("schedules.txt", "a") as f:
        f.write(schedule + "\n")

def delete_schedule(event=None):
    selected = listbox.curselection()
    for index in reversed(selected):
        listbox.delete(index)
        alarm_threads[index].do_run = False
        del alarm_threads[index]

def alarm(alarm_time, schedule):
    t = threading.current_thread()
    while getattr(t, "do_run", True):
        current_time = time.strftime("%H:%M:%S")
        if current_time == alarm_time:
            threading.Thread(target=show_messagebox, args=(schedule,)).start()
            pygame.mixer.init()
            pygame.mixer.music.load(music_var.get())
            pygame.mixer.music.play()
            break
        time.sleep(1)

def show_messagebox(schedule):
    tk.messagebox.showinfo("Alarm", schedule)

def on_closing():
    with open("schedules.txt", "w") as f:
        for schedule in listbox.get(0, "end"):
            f.write(schedule + "\n")
    root.destroy()

root = tk.Tk()
root.title("Schedule Management")

style = ttk.Style()
style.configure("TButton", font=("Helvetica", 12), padding=10)

label = ttk.Label(root, text="Enter schedule (HH:MM:SS Description):")
label.pack()

text = tk.Text(root, height=3)
text.pack()
text.bind("", add_schedule)

button_frame = ttk.Frame(root)
button_frame.pack()

add_button = ttk.Button(button_frame, text="Add", command=add_schedule)
add_button.pack(side="left")

delete_button = ttk.Button(button_frame, text="Delete", command=delete_schedule)
delete_button.pack(side="right")

music_label = ttk.Label(root, text="Select music:")
music_label.pack()

music_var = tk.StringVar(root)
music_files = [f for f in os.listdir() if f.endswith(".mp3")]
music_var.set(music_files[0])
music_optionmenu = ttk.OptionMenu(root, music_var, *music_files)
music_optionmenu.pack()

listbox = tk.Listbox(root, selectmode="extended")
listbox.pack(fill="both", expand=True)

alarm_threads = []

try:
    with open("schedules.txt", "r") as f:
        schedules = sorted(f.readlines(), key=lambda x: x.split()[0])
        for line in schedules:
            listbox.insert("end", line.strip())
            alarm_time = line.split()[0]
            if time.strptime(alarm_time, "%H:%M:%S") > time.localtime()[3:6]:
                alarm_thread = threading.Thread(target=alarm, args=(alarm_time, line.strip()))
                alarm_thread.start()
                alarm_threads.append(alarm_thread)
except FileNotFoundError:
    pass

root.bind("", delete_schedule)
root.protocol("WM_DELETE_WINDOW", on_closing)
root.mainloop()

如下：

求解决措施

所以你希望是什么效果，是不要有空行吗？

如果是，那直接使用Entry就行了。