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Question about .grid( ) and when to apply it tkinter video 2

In the __init__ method of the main class, frame.grid( ) is used AFTER the frame has been added to the dictionary containing all the frames:

self.frames[F] = frame
frame.grid(row=0, column=0, sticky="nesw")

I would have thought that the self.frames would have stored a version of the frame up to that point (i.e., with grid not applied to it), and that the subsequent call to .grid( ) would not apply to the stored version of frame (i..e, the one in the dictionary).

Any clarification on how this might work would be appreciated.