我是Tkinter. 我正在尝试制作电话簿 GUI 应用程序。
所以，我才刚刚开始，这是我的源代码：
#This is my python 'source.py' for learning purpose
from tkinter import Tk
from tkinter import Button
from tkinter import LEFT
from tkinter import Label
from tkinter import Frame
from tkinter import Pack
wn = Tk()
f = Frame(wn)
b1 = Button(f, "One")
b2 = Button(f, "Two")
b3 = Button(f, "Three")
b1.pack(side=LEFT)
b2.pack(side=LEFT)
b3.pack(side=LEFT)
l = Label(wn, "This is my label!")
l.pack()
l.pack()
wn.mainloop()
当我运行时，我的程序出现以下错误：
/usr/bin/python3.4 /home/rajendra/PycharmProjects/pythonProject01/myPackage/source.py
Traceback (most recent call last):
File "/home/rajendra/PycharmProjects/pythonProject01/myPackage/source.py", …