update TODO, and add tutorials from Medium.com
add Automated Test in notes
show the object id in save()
set cache to 6s from 60s
start writing a view since now
use get_list_or_404() shortcut in view.py
change to generic view
set cache
design on 10g step increment in calculating postage fee
find_roundup() to round an interget to the nearest 10
test case for find_roundup()
notes on ploting chart
learn python the hard way
correct find_postage_fee() with e-express in EC-ship. and more testcase about Topic functions
testing example from  RealPython