改变这个代码： from tkinter import * # Import tkinter def procK() : print("OK button is clicked") def processCancel(): print ("Cancel button is clicked") root = Tk # Create a root window btOK = Button (root, text = "OK", fg = "red", command = prock) btCancel = Button (root, text = "Cancel", bg = "yellow' command = processCancel) btOK. pack () # Place the button in the window btCancel.pack() # Place the button in the window root.mainloop() # Create an event loop

这段代码存在一些语法上的错误，需要进行修正。下面是修改后的代码：

from tkinter import *

def procK():
    print("OK button is clicked")

def processCancel():
    print("Cancel button is clicked")

root = Tk()  # Create a root window

btOK = Button(root, text="OK", fg="red", command=procK)
btCancel = Button(root, text="Cancel", bg="yellow", command=processCancel)

btOK.pack()  # Place the button in the window
btCancel.pack()  # Place the button in the window

root.mainloop()  # Create an event loop

主要修改包括：

1. 创建 root 窗口时应该加上括号，即 `root = Tk()`。
2. 创建 btCancel 按钮时，`bg` 参数的值应该是 `"yellow"`，而不是 `"yellow'"`，并且 `command` 参数的赋值语句末尾缺少了一个逗号。
3. 在创建按钮后，应该分别调用 `pack()` 方法将它们放置到窗口中。