On Fri, 25 Mar 2016 00:34:13 -0500, Zachary Ware wrote:
> On Fri, Mar 25, 2016 at 12:10 AM, Wildman via Python-list
> <python-list@python.org> wrote:
>> 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 = """\
> [...]
>> 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.
>
> The bytes constructor in Python 3 requires you to provide an encoding
> (utf-8, ascii, latin-1, koi8, etc) when passing in a string, otherwise
> it doesn't know what bytes you want and refuses to guess. You could
> fix this by adding `encoding='ascii'` to the bytes() call–but I'm not
> certain that that would work in 2.7, and there's a much easier method,
> noted later.
>
>> And why the reference to only
>> the last line of the string?
>
> Because the traceback would be huge if it included the entire function
> call, and there's no need to. You can find the error from just that
> line. It would be arguably more useful to show the first line, but
> that's more difficult to do.
>
>> I am at a loss here. Any help would be greatly appreciated.
>
> What you need here is a bytes literal, which is accomplished by
> prepending a 'b' to the string literal. Your `encoded_icon = """\`
> just needs to become `encoded_icon = b"""\`. See here [1] for more
> information.
Thanks for the info and the link. That fixed the problem.
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<Wildman> GNU/Linux user #557453
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