How to change the tab of ttk.Notebook

Question

I have a ttk.Notebook and with a button I would like to switch to another tab.
How can I achieve this?

It looks that changing the tab state (normal, disabled, and hidden) will not solve my problem since I don't want to disable any tabs.

Here is my code:

import time
import ttk as ttk
import Tkinter as tk

root=tk.Tk()

root.config(width=300,height=220)

notebook=ttk.Notebook(root)
notebook.place(x=0,y=0)

tabList=[]
i=0
while i<6:    
     tabList.append(tk.Frame(root))
     tabList[i].config(width=300,height=150,background='white')
     i+=1

i=0
while i<6: 
    notebook.add(tabList[i],text='tab'+str(i))
    i+=1

def fLoopTabs():
    i=0
    while i<6:
         notebook.select(i)
         time.sleep(2)
         #Here goes the Screenshot function
         i+=1

 button=ttk.Button(root,text='Loop',command=fLoopTabs)
 button.place(x=20,y=180)

 root.mainloop()