Tkinter文本小部件索引

Question

I am building a simple calculator using Python and Tkinter. On this calculator am using the Text widget as the screen.I have buttons with numbers and symbols, which, when pressed, insert a character onto the screen. The idea is that I take the contents of the screen as a string and pass them to eval().

How do I grab this contents of the screen? I've looked at indexing but it just doesn't seem to work.

def buttonCommand(mytext, sym):
   mytext.insert(END, sym)
   if sym == "=":
      return eval() #<-- something goes here?

Answer 1

def buttonCommand(mytext, sym):
   mytext.insert(END, sym)
   if sym == "=":
      return eval(mytext.get())