[Doitsu]

Originally Posted by slowsmile

That's the weird thing. I implemented your import code into the plugin as shown above.

Don't just test the import lines, create a new edit plugin in a bs4test folder with the following plugin.xml code.

Spoiler:

<?xml version="1.0" encoding="UTF-8"?>
<plugin>
<name>bs4test</name>
<type>edit</type>
<author>Doitsu</author>
<autostart>true</autostart>
<description>bs4test</description>
<engine>python3.4</engine>
<version>0.1</version>
<oslist>unx,win,osx</oslist>
</plugin>

and the plugin.py code that I already posted. Then create a epub2 book, add some attributes to tags in Section0001.xhtml and run the test plugin with Used Bundled Python enabled and disabled.
You should get the same results, except for the different Python version numbers.

Do you use a portable version of Sigil by any chance? If so install the regular version.