如何在使用Python Image Library和ImageTk.PhotoImage(Image.open("somefile.py"))时保持纵横比

from PIL import Image, ImageTk
import tkinter as tk

image = Image.open("somefile.py")
width, height = image.size

max_width = 400  # 设置最大宽度
max_height = 300  # 设置最大高度

# 计算缩放比例
scale = min(max_width/width, max_height/height)

# 计算缩放后的宽度和高度
new_width = int(width * scale)
new_height = int(height * scale)

# 缩放图像
image = image.resize((new_width, new_height), Image.ANTIALIAS)

root = tk.Tk()

# 创建PhotoImage对象
photo = ImageTk.PhotoImage(image)

# 创建标签并显示图像
label = tk.Label(root, image=photo)
label.pack()

# 运行Tkinter事件循环
root.mainloop()