import tkinter as tk
from tkinter import simpledialog
root = tk.Tk()
root.withdraw()
root.wm_attributes('-alpha', 0.0)
root.geometry("340x100+50+500")
user_input = simpledialog.askfloat(title="输入框", prompt="请输入内容：", parent=root, initialvalue=34)
user_input = user_input * 60
root.destroy()

add root.wm_attributes('-alpha', 0.0) it's work