python 中tkinter pack的问题

1404461012

这是一个页面，但f3_3的框架无法显示（我指定他的颜色为黑，来查看他是否显示了），f3_3框架本应显示在左边的空白区域，应该如何做？

from tkinter import *

root = Tk()
f3_str = StringVar()
f3_str.set('sdafd')
frame3 = Frame(root,height = 400, width = 600)
frame3.propagate(0)
frame3.pack()
f3_1 = Frame(frame3,height = 280, width = 70,bg = 'black')
f3_1.propagate(0)
f3_1.pack(padx = 0, pady = 20, anchor = 'ne')
f3_2 = Frame(frame3, height = 100, width = 70)
f3_2.pack(padx = 0, pady = 10, anchor = 'se')
f3_2.propagate(0)
pre = Button(f3_1, text = '上一页')
pre.pack(padx = 10, pady = 10, anchor = 'nw')
nt = Button(f3_1, text = '下一页', anchor = 'nw')
nt.pack(padx = 10, pady = 10, anchor = 'nw')
download_ok = Button(f3_2, text = '下载')
download_ok.pack(padx = 10, pady = 10, anchor = 'sw')
f3_3 = Frame(frame3, height = 400, width = 500,bg = 'black')
f3_3.propagate(0)
f3_3.pack(padx = 10, pady = 10, anchor = 'nw')
textlabel = Label(f3_3, textvariable = f3_str, fg = 'green')
textlabel.pack(anchor = 'n',pady = 5)
mainloop()

1404461012

我会了，设置side就可以了