为什么在 Python GUI Tkinter Grid 系统对我来说不能正常工作？

Question

下面的代码是我的python代码。我正在尝试用 GUI Tkinder 制作一个简单的计算器，但是这里的网格系统对我来说不能正常工作，请大家说是什么问题。

from Tkinter import *
from tkinter import font

window = Tk()
Screen = Label(window,
               text="Calculator",
               bg="#2ecc71",
               width=26,
               height=2,
               font=("Verdana", 22))

myFont = font.Font(size=12)


num7 = Button(window,
              text=7,
              height=5,
              width=10)
num7['font'] = myFont


num8 = Button(window,
              text=8,
              height=5,
              width=10)
num8['font'] = myFont

num9 = Button(window,
              text=9,
              height=5,
              width=10)
num9['font'] = myFont

window.geometry("500x500+420+120")
#window.resizable(False, False)     #commented for seeing the button that comes out of the boundary
window.title("Calculator -by Jobin")

Screen.grid(row=0, column=0, padx=10, pady=10)
num7.grid(row=1, column=0)
num8.grid(row=1, column=1)
num9.grid(row=1, column=2)

window.mainloop()

Answer 1

from tkinter import *
from tkinter import font

window = Tk()
Screen = Label(window,
               text="Calculator",
               bg="#2ecc71",
               width=26,
               height=2,
               font=("Verdana", 22))

myFont = font.Font(family='Verdana', size=36, weight='bold')


num7 = Button(window,
              text=7)
num7['font'] = myFont


num8 = Button(window,
              text=8)
num8['font'] = myFont

num9 = Button(window,
              text=9)
num9['font'] = myFont

window.geometry("500x500+420+120")
#window.resizable(False, False)     #commented for seeing the button that comes out of the boundary
window.title("Calculator -by Jobin")

Screen.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
num7.grid(row=1, column=0)
num8.grid(row=1, column=1)
num9.grid(row=1, column=2)

window.mainloop()

添加了列跨度。更多信息请看这里： https://effbot.org/tkinterbook/grid.htm 这里是按钮和字体： How to change font and size of buttons and frame in tkinter using python?