from tkinter import *

root = Tk()
vbar = Scrollbar(root)
text = Text(root, height=5)

vbar.config(command=text.yview) 
text.config(yscrollcommand=vbar.set)    

vbar.pack(side=RIGHT, fill=Y)
text.pack(expand=YES)

# comment-out second see() to see the see() bug

text.insert(END, 'aaa\nbbb\nccc\nddd\neee\nfff\nggg\n')
text.see('1.0')
text.see('1.0')     # because once is not enough...
root.mainloop()