python - Tkinter 不能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]

怎么了？标签是与列表不兼容的类吗？

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