from tkinter import *
def aumentar():
    current_count = int(label_var.get())
    label_var.set(current_count + 1)
def diminuir():
    current_count = int(label_var.get())
    label_var.set(current_count - 1)
root = Tk()
root.title("Aplicação contar")
root.geometry("300x200")
root.resizable(0,0)
label_var = StringVar()
label_var.set("0")
contar = Label(root, textvariable=label_var, font=("Arial", 45,"bold"), padx=20, pady=10)
contar.place(relx=0.35,rely=0.15)
Butão_aumento = Button(root, text="Aumento", font=("Arial", 14), command=aumentar)
Butão_aumento.place(relx=0.15,rely=0.7)
Butão_diminucao = Button(root, text="Diminuição", font=("Arial", 14),command=diminuir)
Butão_diminucao.place(relx=0.55,rely=0.7)
root.mainloop()