Print func textbox instead of shell

[nilamo]

This seems to work:

>>> import tkinter as tk
>>> root = tk.Tk()
>>> in_text = tk.Text(root, height=20, width=30)
>>> in_text.pack()
>>> out_text = tk.Text(root, height=20, width=30)
>>> out_text.pack()
>>> def on_click():
...   value = in_text.get("0.0", tk.END)
...   out_text.insert("0.0", "you clicked!" + value * 2)
...
>>> tk.Button(root, height=1, width=10, text="Commit", command=on_click).pack()