import tkinter as tk
import tkinter.messagebox as box
import tkinter.font as tkf


present_value = 0

def click(val):
    global present_value
    present_value+=val
    calc_result.set(str(present_value))
    #box.showinfo("notice","click")
    entry.delete(0,tk.END)
    #entry.get(0,tk.END)
    entry.insert(tk.END,present_value)

def bclick():
    print("bclick")
    #b=entry.get()
    #print(b)
    click(10)


window = tk.Tk()
window.title("ttt")
window.geometry("500x500")
font=tkf.Font(family="¸¼Àº°íµñ",size=20)

calc_result = tk.StringVar()


label=tk.Label(window,textvariable=calc_result,height=3)
label.pack()

entry=tk.Entry(window)
entry.pack()

button=tk.Button(window,text="button",width=10,height=3,command=bclick())
button.pack()

btn1=tk.Button(window,text="1")
#btn1.grid(row=1,column=1)
btn1.pack()

btn2=tk.Button(window,text="2")
#btn2.grid(row=1,column=2)
btn2.pack()

btns=[btn1,btn2]

def button_click(val):
    val=int(val)
    click(val)

for btn in btns:
    #btn.grid(sticky="news",padx=5,pady=5)
    btn.config(font=font,width=3,height=2)
    btn.config(command=lambda cmd=btn.cget("text"):button_click(cmd))


window.mainloop()