#!/usr/bin/python3
import tkinter as tk
elem='тест'
max_elems=1001
text=(elem+' ')*max_elems
text=text[:-1]
pos_lst=[]
pos2=-2
for i in range(max_elems):
	pos1=pos2+2
	pos2=pos1+len(elem)-1
	pos_lst+=[[pos1,pos2]]
def move_right(event):
	if res[0] < len(pos_lst)-1:
		res[0]+=1
		select_term()
		
def move_left(event):
	if res[0] > 0:
		res[0]-=1
		select_term()
def select_term():
	if len(pos_lst) > 0:
		pos1=pos_lst[res[0]][0]
		pos1='1.'+str(pos1)
		pos2=pos_lst[res[0]][1]
		pos2='1.'+str(pos2+1)
		txt.tag_remove('cur_term','1.0','end')
		txt.tag_add('cur_term',pos1,pos2)
		txt.mark_set('insert',pos2)
		txt.tag_config('cur_term',background='cyan',font='Sans 14')
		txt.yview('insert')
root=tk.Tk()
res=[0]
frame=tk.Frame(root)
frame.pack()
txt=tk.Text(frame)
txt.focus_set()
txt.insert('end',text)
txt.mark_set('insert','1.0')
txt.yview('1.0')
txt.config(state='disabled')
txt.pack(expand=1)
select_term()
txt.bind('<Left>',move_left)
txt.bind('<Right>',move_right)
root.wait_window()
root.mainloop()

 text["height"]

import Tkinter
#
root = Tkinter.Tk()
#
def call(event):
    event.widget.update_idletasks()
    print event.widget.bbox("current")
#
text = Tkinter.Text(root, width=20, height=20)
text.pack()
text.bind("<Return>", call)
#
root.mainloop()