python清空tree.insert()

import tkinterfrom tkinter import ttk  # 导入内部包li = ['王记', '12', '男']root = tkinter.Tk()root.title('测试')tree = ttk.Treeview(root, columns=['1', '2', '3'], show='headings')tree.column('1', width=100, anchor='center')tree.column('2', width=100, anchor='center')tree.column('3', width=100, anchor='center')tree.heading('1', text='姓名')tree.heading('2', text='学号')tree.heading('3', text='性别')tree.insert('', 'end', values=li)tree.grid()def delButton(tree):    x = tree.get_children()    for item in x:        tree.delete(item)delButton(tree)root.mainloop()