基于python的windows快捷使用

import tkinter as tk
import os
def cmd():
    os.system("start cmd")
def calc():
    os.system("start calc")
def osk():
    os.system("start osk")
def Dos():
    dos=tk.Tk()
    dos.title("DOS_cmd")
    dos.geometry("300x300")
    l1=tk.Label(dos,text="命令:")
    l1.pack()
    user_text=tk.Entry(dos)
    user_text.pack(ipadx=300)
    def getuser():
        user=user_text.get()
        os.system(str(user))
    b1=tk.Button(dos,text="确定",command=getuser).pack()
root = tk.Tk()
root.geometry("500x600")
root.title("windows困难使用")
b1=tk.Button(root,text="DOS",command=Dos).pack(ipadx=500)
b1=tk.Button(root,text="计算器",command=calc).pack(ipadx=500)
b1=tk.Button(root,text="屏幕键盘",command=osk).pack(ipadx=500,)
root.mainloop()
def dos():
    dos=tk.Tk()
    dos.title("DOS_cmd")
    dos.geometry("300x300")
    l1=tk.Label(ytm,text="命令:")
    l1.pack()
    user_text=tk.Entry()
    user_text.pack()
    def getuser():
        user=user_text.get()