Good Sudoku clipboard format

goodsudoku.py

#!/usr/bin/env python3

import base64

#Good Sudoku's share puzzle clipboard format
#given the starting puzzle:
#7.. 64. 2..
#.6. 7.. 4..
#..8 ..5 .9.
#
#... ..7 ..5
#... .3. ...
#8.. 1.. ...
#
#.3. 4.. 8..
#..6 ..3 .1.
#..5 .16 ..7

#copy link gives this text:
#Check out this puzzle in GoodSudoku!  playgoodsudoku.com/puzzle/$cAZAIABgcAQAAIAFCQAAAHAFAAAwAAgAEAAAAwQAgAAGADAQAFAWAHA=
# using the end of the URL string:
s = "$cAZAIABgcAQAAIAFCQAAAHAFAAAwAAgAEAAAAwQAgAAGADAQAFAWAHA="
#this is data of the puzzle encoded in base64
tb64 = base64.b64decode(s)
for i in tb64:
	s = "0x%02x," % i
	print("%-6s"%s, end='')
print("\n\n\n")
#output of this is
# 0x70, 0x06, 0x40, 0x20, 0x00, 0x60, 0x70, 0x04, 0x00, 
# 0x00, 0x80, 0x05, 0x09, 0x00, 0x00, 0x00, 0x70, 0x05, 
# 0x00, 0x00, 0x30, 0x00, 0x08, 0x00, 0x10, 0x00, 0x00, 
# 0x03, 0x04, 0x00, 0x80, 0x00, 0x06, 0x00, 0x30, 0x10, 
# 0x00, 0x50, 0x16, 0x00, 0x70, 
#  Each byte is 2 squares of the puzzle, the upper 4 bits are one number
#   and the lower 4 bits is the next square
#  Squares are tightly packed and there is a pad 0 at the end (since there are only 81 numbers)

t = []
for i in tb64:
	low  = i & 0xf;
	high = i >> 4;
	t.append(high)
	t.append(low)

print (t)
print("\n\n\n")

for i in range(0, len(t)):
	if (t[i] == 0):
		print('.', end='')
	else:
		print (t[i], end='')
	if (i%9) == 8:
		print()