[Tkinter] bind lambda keypress counter

[knoxvilles_joker]

Line 37 in the first code sample: why do you use a lambda to return the function final_count? Don't you just want the final_count function to be bound to the keypress event? In that case, you should just be passing final_count to bind.

By using classes the attributes can be accessed without using global.
Add logic to the button press event to reset the counter at zero.

import tkinter as tk


INITIAL_COUNTER_VALUE = 500


class TkApp(tk.Tk):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.geometry("640x400")
        self.configure(bg='black')
        self.title("Sentry Terminal")
        self.counter = tk.IntVar()
        self.counter.set(INITIAL_COUNTER_VALUE)
        tk.Grid.rowconfigure(self, 0, weight=1, uniform='a')
        tk.Grid.columnconfigure(self, 0, weight=1, uniform='a')
        tk.Grid.rowconfigure(self, 1, weight=1, uniform='b')
        tk.Grid.columnconfigure(self, 1, weight=1, uniform='b')
        rounds = tk.Button(self, justify=tk.CENTER, textvariable=self.counter)
        rounds.grid(row=0, column=0, sticky="EW")
        label1 = tk.Label(self, textvariable=self.counter)
        label1.grid(row=1, column=0, sticky="EW")
        self.bind("<KeyPress-f>", self.on_keypress_f)

    def on_keypress_f(self, evet):
        counter_value = self.counter.get()
        counter_value = counter_value-1 or INITIAL_COUNTER_VALUE
        self.counter.set(counter_value)


tk_app = TkApp()
tk_app.mainloop()

I am still wrapping my head around things. Is there any documentation you can refer me to to read up on so I might get properly educated?