Problem With Embedded Icon and Python 3.4

[Wildman]

I have a program that I have been trying to rewrite so it will
run on Python 2.7 and 3.4.  It has been a pain to say the least.
Thank $DIETY for aliases.  Anyway, I got it all working except
for one thing.  The program has an embedded icon.  It is displayed
in the window's titlebar.  The icon is a 16x16 png that has been
base64 encoded using a Linux utility called memencoder.  The code
below works perfectly with Python 2.7.  The icon data is complete
for anyone that wants to try to run this code:

encoded_icon = """\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=="""

root = Tk()
decoded_icon=base64.decodestring(encoded_icon)
image_icon = Image.open(io.BytesIO(decoded_icon))
icon = ImageTk.PhotoImage(image_icon)
root.call('wm', 'iconphoto', root._w, icon)
app = Window(root)
root.mainloop()


When I run the program with Python 3.4, I get this error:

Traceback (most recent call last):
  File "/usr/lib/python3.4/base64.py", line 519, in _input_type_check
    m = memoryview(s)
TypeError: memoryview: str object does not have the buffer interface

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "./myprogram.py", line 276, in <module>
    decoded_icon=base64.decodestring(encoded_icon)
  File "/usr/lib/python3.4/base64.py", line 561, in decodestring
    return decodebytes(s)
  File "/usr/lib/python3.4/base64.py", line 553, in decodebytes
    _input_type_check(s)
  File "/usr/lib/python3.4/base64.py", line 522, in _input_type_check
    raise TypeError(msg) from err
TypeError: expected bytes-like object, not str


I tried converting the icon string to a byte variable like this:

encoded_icon = bytes("""\
iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAABGdBTUEAALGPC/xhBQAAACBj
    (...)
ZGlmeQAyMDE2LTAzLTIxVDE1OjE5OjI3LTA1OjAwe2m2vwAAAABJRU5ErkJggg==""")


That give me a different error:

Traceback (most recent call last):
  File "./myprogram.py", line 269, in <module>
    ZGlmeQAyMDE2LTAzLTIxVDE1OjE5OjI3LTA1OjAwe2m2vwAAAABJRU5ErkJggg==""")
TypeError: string argument without an encoding

I'm not sure what that means.  I looks like it wants the string
to be encoded but it already is.  And why the reference to only
the last line of the string?

I am at a loss here.  Any help would be greatly appreciated.

-- 
<Wildman> GNU/Linux user #557453
Old enough to know better... too young to resist.