Python Tkinter Text Widget with Auto & Custom Scroll

Question

I wrote a simple Tkinter based Python application that reads text from a serial connection and adds it to the window, specifically a text widged.

After a lot of tweaks a

Answer 1

It's hard to tell what's really going on but have you considered using a Queue?

from Tkinter import *
import time, Queue, thread

def simulate_input(queue):
    for i in range(100):
        info = time.time()
        queue.put(info)
        time.sleep(0.5)

class Demo:
    def __init__(self, root, dataQueue):
        self.root = root
        self.dataQueue = dataQueue

        self.text = Text(self.root, height=10)
        self.scroller = Scrollbar(self.root, command=self.text.yview)
        self.text.config(yscrollcommand=self.scroller.set)
        self.text.tag_config('newline', background='green')
        self.scroller.pack(side='right', fill='y')
        self.text.pack(fill='both', expand=1)

        self.root.after_idle(self.poll)

    def poll(self):
        try:
            data = self.dataQueue.get_nowait()
        except Queue.Empty:
            pass
        else:
            self.text.tag_remove('newline', '1.0', 'end')
            position = self.scroller.get()
            self.text.insert('end', '%s\n' %(data), 'newline')            
            if (position[1] == 1.0):
                self.text.see('end')
        self.root.after(1000, self.poll)

q = Queue.Queue()
root = Tk()
app = Demo(root, q)

worker = thread.start_new_thread(simulate_input, (q,))
root.mainloop()