tkinter制作钢琴界面，一直显示if表达式错误，该怎么修改呢

Question

from tkinter import *
root = Tk()

root.geometry("700x200")
frame1 = Frame(root)
frame1.pack()
frame2 = Frame(root)
frame2.pack()
buttonlist = ["流行音乐", "中国古典乐", "日本音乐", "金属风乐", "轻音乐"]
for b in buttonlist:
Button(frame1, text=b).pack(side="left", padx=10)
for i in range(15):
Label(frame2, width=5, height=10, borderwidth=2, relief="solid",
bg="black" if i%2==0 else bg="white").pack(side="left", padx=2)

root.mainloop()

Answer 1

去掉else 后面的 bg= 只要值的这种