如何在Tkinter的另一个框架内添加框架？

Question

I am trying to add a frame inside the another frame using tkinter, but the frame is not added:

Code:

lframe=Frame(r,width=1000,height=650,relief='raise',bd=8).pack(side=LEFT)

rframe=Frame(r,width=350,height=650,relief='raise',bd=8).pack(side=RIGHT)



lframe1=Frame(lframe,width=1000,height=100,bd=8,relief='raise').pack(side= TOP)

lframe2=Frame(lframe,width=1000,height=55,bd=8,relief='raise').pack(side=TOP)

rframe1=Frame(rframe,width=350,height=215,relief='raise',bd=8).pack(side=TOP)

rframe2=Frame(rframe,width=350,height=415,relief='raise',bd=8).pack(side=TOP)

r.mainloop()

its shows the following output

Answer 1

What caused your problem?

lframe is worth None and does not refer to the frame instance you created in anyway. Why so?

Because pack() , gird() and place() layout managers are functions that return nothing. So when you write:

lframe=Frame(r,width=1000,height=650,relief='raise',bd=8).pack(side=LEFT)

You are clearly getting None from pack(side=LEFT)

How to fix your problem?

Simply follow this principle whenever you create a widget: create then position (In your case, you create and position the widget on the same time). I personally refer to this principle as The SaYa idiom . This means the previous line of code should be written as follows:

lframe=Frame(r,width=1000,height=650,relief='raise',bd=8)
lframe.pack(side=LEFT)

Apply this idiom to all your widgets and that will save you from some troubles.