Can't configure tkinter object Listbox

Question

When I run this code to create a Listbox and change its appearance, I am given the error "'NoneType' object has no attribute 'configure'":

listbox = Listbox(myscreen).grid(row=1, column=0, sticky=NSEW, rowspan=2)
listbox.config(border=2, relief=SUNKEN)

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Answer 1

Try configuring the listbox before placing it.

listbox = Listbox(myscreen)
listbox.config(border=2, relief=SUNKEN)
listbox.grid(row=1, column=0, sticky=NSEW, rowsoan=2)