Following Sentdex tutorial in Youtube Multiple Windows/Frames in Tkinter GUI with Python - Tkinter tutorial Python 3.4 p. 4, you have to hardcode a line each time you create a new class that's a page.
This solution try to offer a dinamic way of iterating throught the classes that should be in SeaofBTCapp's constructor loop.
1 - Every class that is a page to be shown need to have a name pattern, like start with "Page";
2 - SeaofBTCapp's method "show_frame" now must pass in "string way" the class name. So you need to change all the method's callings.