'''开发记事本软件的菜单'''
from tkinter.filedialog import *
from tkinter.colorchooser import *
from tkinter.filedialog import *
class Application(Frame):
def __init__(self,master=None):
super().__init__(master)
self.master = master
self.textpad = None
self.pack()
self.createWidget()
def createWidget(self):
# 创建主菜单栏
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栏
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)
#添加菜单栏
menuFile.add_command(label="新建",accelerator="ctrl+n",command=self.newfile)
menuFile.add_command(label="打开",accelerator="ctrl+o",command=self.openfile)
menuFile.add_command(label="保存",accelerator="ctrl+s",command=self.savefile)
menuFile.add_separator()#添加分割线
menuFile.add_command(label="退出",accelerator="ctrl+q",command=self.exit)
#将菜单栏加到根窗口
root["menu"] = menubar
#增加快捷键
root.bind("<Control-n>",lambda event:self.newfile())
root.bind("<Control-o>",lambda event:self.openfile())
root.bind("<Control-s>",lambda event:self.savefile())
root.bind("<Control-q>",lambda event:self.exit())
#文本编辑区
self.textpad = Text(root,width=50,height=30)
self.textpad.pack()
#创建上下菜单
self.contextMenu = Menu(root)
self.contextMenu.add_command(label="背景颜色",command=self.openAskColor)
#为右键绑定事件
root.bind("<Button-3>",self.createContextMenu)
def newfile(self):
self.filename = askopenfilename(title="另存为",initialfile="未命名.txt",
filetype=[("文本文档","*.txt")],
defaultextension=".txt")
self.savefile()
def openfile(self):
# with open(askopenfile(),"r",encoding="utf-8") as f:
# self.textpad.insert(INSERT,f.read())
with open(askopenfilename(title="打开文本文件"),"r",encoding='utf-8') as f: #转译后需要改成这个
self.textpad.insert(INSERT,f.read())
self.filename = f.name
def savefile(self):
with open(self.filename,"w") as f:
c = self.textpad.get(1.0,END)
f.write(c)
def exit(self):
root.quit()
def openAskColor(self):
s1 = askcolor(color="red",title="选择背景色")
self.textpad.config(bg=s1[1])
def createContextMenu(self,event):
# 菜单在鼠标右键单机坐标处显示
self.contextMenu.post(event.x_root,event.y_root)
if __name__ == "__main__":
root = Tk()
root.geometry("300x300+200+200")
root.title("记事本")
app = Application(master=root)
root.mainloop()

老师,您帮我看一下,为什么我这个新建文件不可以,提示我让我打开