Tkinter无法将标签附加到列表中？

Question

labels = []
global labels
#blablbalabla code
welcome = Tkinter.Label(root,text= "Welcome to Fobby").place(x=250,y=250)
labels.append(welcome)
print labels
>>> [None]

有什么问题？标签是否与列表不兼容？

Answer 1

这是因为place()返回None：

labels = []
welcome = Tkinter.Label(root,text= "Welcome to Fobby")
welcome.place(x=250,y=250)
labels.append(welcome)
print labels