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/topazextract.py

@@ -7,9 +7,10 @@
 # Changelog
 #  4.9  - moved unicode_argv call inside main for Windows DeDRM compatibility
 #  5.0  - Fixed potential unicode problem with command line interface
+#  6.0  - Added Python 3 compatibility for calibre 5.0
 
 from __future__ import print_function
-__version__ = '5.0'
+__version__ = '6.0'
 
 import sys
 import os, csv, getopt
@@ -17,7 +18,7 @@ import zlib, zipfile, tempfile, shutil
 import traceback
 from struct import pack
 from struct import unpack
-from alfcrypto import Topaz_Cipher
+from calibre_plugins.dedrm.alfcrypto import Topaz_Cipher
 
 class SafeUnbuffered:
     def __init__(self, stream):
@@ -26,7 +27,7 @@ class SafeUnbuffered:
         if self.encoding == None:
             self.encoding = "utf-8"
     def write(self, data):
-        if isinstance(data,unicode):
+        if isinstance(data,bytes):
             data = data.encode(self.encoding,"replace")
         self.stream.write(data)
         self.stream.flush()
@@ -64,7 +65,7 @@ def unicode_argv():
             # Remove Python executable and commands if present
             start = argc.value - len(sys.argv)
             return [argv[i] for i in
-                    xrange(start, argc.value)]
+                    range(start, argc.value)]
         # if we don't have any arguments at all, just pass back script name
         # this should never happen
         return [u"mobidedrm.py"]
@@ -72,7 +73,7 @@ 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 argv
 
 #global switch
 debug = False
@@ -196,7 +197,7 @@ def decryptDkeyRecords(data,PID):
 
 class TopazBook:
     def __init__(self, filename):
-        self.fo = file(filename, 'rb')
+        self.fo = open(filename, 'rb')
         self.outdir = tempfile.mkdtemp()
         # self.outdir = 'rawdat'
         self.bookPayloadOffset = 0
@@ -319,7 +320,7 @@ class TopazBook:
         fixedimage=True
         try:
             keydata = self.getBookPayloadRecord('dkey', 0)
-        except DrmException, e:
+        except DrmException as e:
             print(u"no dkey record found, book may not be encrypted")
             print(u"attempting to extrct files without a book key")
             self.createBookDirectory()
@@ -345,7 +346,7 @@ class TopazBook:
             data = keydata
             try:
                 bookKeys+=decryptDkeyRecords(data,pid)
-            except DrmException, e:
+            except DrmException as e:
                 pass
             else:
                 bookKey = bookKeys[0]
@@ -357,7 +358,7 @@ class TopazBook:
 
         self.setBookKey(bookKey)
         self.createBookDirectory()
-        self.extractFiles() 
+        self.extractFiles()
         print(u"Successfully Extracted Topaz contents")
         if inCalibre:
             from calibre_plugins.dedrm import genbook
@@ -411,7 +412,7 @@ class TopazBook:
                     print(u".", end=' ')
                     record = self.getBookPayloadRecord(name,index)
                     if record != '':
-                        file(outputFile, 'wb').write(record)
+                        open(outputFile, 'wb').write(record)
                 print(u" ")
 
     def getFile(self, zipname):
@@ -454,7 +455,7 @@ def cli_main():
 
     try:
         opts, args = getopt.getopt(argv[1:], "k:p:s:x")
-    except getopt.GetoptError, err:
+    except getopt.GetoptError as err:
         print(u"Error in options or arguments: {0}".format(err.args[0]))
         usage(progname)
         return 1
@@ -513,7 +514,7 @@ def cli_main():
         # removing internal temporary directory of pieces
         tb.cleanup()
 
-    except DrmException, e:
+    except DrmException as e:
         print(u"Decryption failed\n{0}".format(traceback.format_exc()))
 
         try:
@@ -522,8 +523,8 @@ def cli_main():
             pass
         return 1
 
-    except Exception, e:
-        print(u"Decryption failed\m{0}".format(traceback.format_exc()))
+    except Exception as e:
+        print(u"Decryption failed\n{0}".format(traceback.format_exc()))
         try:
             tb.cleanup()
         except: