Starting on Version 7.0 using the work done by others. Completely untested. I will be testing things, but I thought I'd get this base version up for others to give pull requests.

THIS IS ON THE MASTER BRANCH. The Master branch will be Python 3.0 from now on. While Python 2.7 support will not be deliberately broken, all efforts should now focus on Python 3.0 compatibility.

I can see a lot of work has been done. There's more to do. I've bumped the version number of everything I came across to the next major number for Python 3.0 compatibility indication.

Thanks everyone. I hope to update here at least once a week until we have a stable 7.0 release for calibre 5.0

DeDRM_plugin/epubtest.py

@@ -10,6 +10,7 @@
 # Changelog epubtest
 #  1.00 - Cut to epubtest.py, testing ePub files only by Apprentice Alf
 #  1.01 - Added routine for use by Windows DeDRM
+#  2.00 - Added Python 3 compatibility, September 2020
 #
 # Written in 2011 by Paul Durrant
 # Released with unlicense. See http://unlicense.org/
@@ -47,7 +48,7 @@
 from __future__ import with_statement
 from __future__ import print_function
 
-__version__ = '1.01'
+__version__ = '2.0'
 
 import sys, struct, os, traceback
 import zlib
@@ -116,7 +117,7 @@ def unicode_argv():
         argvencoding = sys.stdin.encoding
         if argvencoding == None:
             argvencoding = "utf-8"
-        return [arg if (type(arg) == unicode) else unicode(arg,argvencoding) for arg in sys.argv]
+        return arg
 
 _FILENAME_LEN_OFFSET = 26
 _EXTRA_LEN_OFFSET = 28