我找到了这个问题的解决办法。我试图解决一个类似的问题：我想把图像贴上标签。我将图像大小设置为标签大小。当我试图用命令label.config(image=img)放置它时，标签大小会增大。图像的大小是我设置的，所以它没有完全覆盖标签。我在用网格管理器。所有尺寸均未输入“高级”，而是由Tkinter计算。我用的是grid_columnconfigure和grid_rowconfigure。我找到的解决方案是将这个带有图像的标签(或者您的例子中的按钮)设置为LabelFrame，并将grid_propagate设置为False。

代码示例：MyWindow = tk.Tk()

MyWindow.geometry("500x550")

#create LabelFrame (200x200)

label = tk.LabelFrame(MyWindow, width=200, height=200)

#grid manager to set label localization

labelk.grid(row=0, column=0)

#label row and column configure: first argument is col or row id

label.grid_rowconfigure(0, weight=1)

label.grid_columnconfigure(0, weight=1)

#cancel propagation

label.grid_propagate(False)

#Create button and set it localization. You can change it font without changing size of button, but if You set too big not whole will be visible

button = t.Button(label, text="Hello!", font=('Helvetica', '20'))

#Use sticky to button took up the whole label area

button.grid(row=0, column=0, sticky='nesw')

MyWindow.mainloop()

字体大小40和20的结果：

通过网格管理器创建具有动态大小的按钮的示例：MyWindow = tk.Tk()

MyWindow.geometry("500x550")

#Divide frame on 3x3 regions

for col in range(3):

MyWindow.grid_columnconfigure(col, weight=1)

for row in range(3):

MyWindow.grid_rowconfigure(row, weight=1)

label = tk.LabelFrame(MyWindow)

#Put label in the middle

label.grid(row=1, column=1, sticky='nesw')

label.grid_propagate(False)

label.grid_rowconfigure(0, weight=1)

label.grid_columnconfigure(0, weight=1)

button = tk.Button(label, text="Hello!", font=('Helvetica', '30'))

button.grid(row=0, column=0, sticky='nesw')

MyWindow.mainloop()

这是个迟交的答复，但也许能帮上忙。