python - What OOP techniques are used in this code? Is it aggregation, composition, generalization, association or just dependency?

Question

I would like to ask whether the aggregation or dependency is used in this code? In other words, how is class StartPage() dependant on the class SeaofBTCapp?

import tkinter as tk

class SeaofBTCapp(tk.Tk):

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        container = tk.Frame(self)

        container.pack(side="top", fill="both", expand = True)

        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}
        frame = StartPage(container, self)
        self.frames[StartPage] = frame
        frame.grid(row=0, column=0, sticky="nsew")
        self.show_frame(StartPage)

    def show_frame(self, cont):
        frame = self.frames[cont]
        frame.tkraise()

class StartPage(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self,parent)
        label = tk.Label(self, text="Start Page")
        label.pack(pady=10,padx=10)

app = SeaofBTCapp()
app.mainloop()

Answer 1

how is class StartPage() dependant on the class SeaofBTCapp?

StartPage is designed to act as a single page in a multi-page app. It requires that some other object or program is responsible for creating it and causing it to be displayed. Loosly speaking, this is a view in the model, view, controller pattern.

SeaofBTCapp is a class designed to display one page at a time, where pages are implemented as frames composed of one or more additional widgets. It acts as the controller in the model, view, controller pattern.

Using your terminology, SeaofBTCapp is an aggregated object since it is composed of many pages.