# coding=utf-8
# 记事本项目
from tkinter import *
from tkinter.filedialog import *
class Application(Frame):
def __init__(self,master=None):
super().__init__(master)
self.master = master
self.pack()
self.textpad = None
self.creatwidget()
def creatwidget(self):
# 创建主菜单
menubar = Menu(root)
# 创建子菜单
menuFile = Menu(menubar)
menuEdit = Menu(menubar)
menuHelp = Menu(menubar)
# 将子菜单加入到主菜单
menubar.add_cascade(label='文件(F)', menu=menuFile)
menubar.add_cascade(label='编辑(E)', menu=menuEdit)
menubar.add_cascade(label='帮助(H)', menu=menuHelp)
# 添加菜单项
menuFile.add_command(label='新建',accelerator='ctrl+n',command=self.test)
menuFile.add_command(label='打开', accelerator='ctrl+o', command=self.openfile)
menuFile.add_command(label='保存', accelerator='ctrl+s', command=self.test)
menuFile.add_separator() # 添加分割线
menuFile.add_command(label='退出', accelerator='ctrl+q', command=self.test)
#将主菜单加到root
root['menu']=menubar
#文本编辑区
self.textpad = Text(root,width=50,height=30).pack()
def test(self):
pass
def openfile(self):
with askopenfile(title='打开文本文件') as f:
self.textpad.insert(INSERT, f.read())
self.filename = f.name
if __name__ == '__main__':
root = Tk()
root.geometry("450x300+200+300")
root.title("百战程序员的简易记事本")
app = Application(master=root)
root.mainloop()
老师我想请问一下这里显示AttributeError: 'NoneType' object has no attribute 'insert' 要怎么解决