如何使用tkin改变下拉列表的位置

Question

我正在尝试制作一个简单的下拉gui，但是我需要一些关于如何定位下拉菜单的帮助，完整代码是： 将tkinter作为tk导入

from tkinter import *

root=tk.Tk()




canvas1 = tk.Canvas(root, width = 400, height = 300)
canvas1.pack()

username = tk.Entry(root)
canvas1.create_window(200,140, window=username)
canvas1.create_text(100,140,fill="darkblue",text="username")

password = tk.Entry(root)
canvas1.create_window(200,180,window=password)
canvas1.create_text(100,180,fill="darkblue",text="password")

variable = StringVar(root)
variable.set("Facebook")

w=OptionMenu(root , variable, "Facebook","Twitter","Spotify","Swiggy")
w.pack()

button1= tk.Button(text='Go')
canvas1.create_window(250,250, window=button1)

root.mainloop()

下拉菜单是通过使用OptionMenu获得的，但我无法更改其位置，我需要帮助 仅用于选项菜单的代码：

from Tkinter import *

master = Tk()

variable = StringVar(master)
variable.set("one") # default value

w = OptionMenu(master, variable, "one", "two", "three")
w.pack()

mainloop()