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/convert2xml.py

@@ -1,6 +1,7 @@
 #! /usr/bin/python
 # vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab
 # For use with Topaz Scripts Version 2.6
+# Added Python 3 compatibility, September 2020
 
 from __future__ import print_function
 class Unbuffered:
@@ -107,7 +108,7 @@ def readString(file):
 def convert(i):
     result = ''
     val = encodeNumber(i)
-    for j in xrange(len(val)):
+    for j in range(len(val)):
         c = ord(val[j:j+1])
         result += '%02x' % c
     return result
@@ -121,10 +122,10 @@ class Dictionary(object):
     def __init__(self, dictFile):
         self.filename = dictFile
         self.size = 0
-        self.fo = file(dictFile,'rb')
+        self.fo = open(dictFile,'rb')
         self.stable = []
         self.size = readEncodedNumber(self.fo)
-        for i in xrange(self.size):
+        for i in range(self.size):
             self.stable.append(self.escapestr(readString(self.fo)))
         self.pos = 0
 
@@ -151,7 +152,7 @@ class Dictionary(object):
         return self.pos
 
     def dumpDict(self):
-        for i in xrange(self.size):
+        for i in range(self.size):
             print("%d %s %s" % (i, convert(i), self.stable[i]))
         return
 
@@ -161,7 +162,7 @@ class Dictionary(object):
 
 class PageParser(object):
     def __init__(self, filename, dict, debug, flat_xml):
-        self.fo = file(filename,'rb')
+        self.fo = open(filename,'rb')
         self.id = os.path.basename(filename).replace('.dat','')
         self.dict = dict
         self.debug = debug
@@ -392,7 +393,7 @@ class PageParser(object):
         'startID'      : (0, 'number', 1, 1),
         'startID.page' : (1, 'number', 0, 0),
         'startID.id'   : (1, 'number', 0, 0),
-    
+
         'median_d'          : (1, 'number', 0, 0),
         'median_h'          : (1, 'number', 0, 0),
         'median_firsty'     : (1, 'number', 0, 0),
@@ -420,7 +421,7 @@ class PageParser(object):
     def get_tagpath(self, i):
         cnt = len(self.tagpath)
         if i < cnt : result = self.tagpath[i]
-        for j in xrange(i+1, cnt) :
+        for j in range(i+1, cnt) :
             result += '.' + self.tagpath[j]
         return result
 
@@ -472,7 +473,7 @@ class PageParser(object):
 
         if self.debug : print('Processing: ', self.get_tagpath(0))
         cnt = self.tagpath_len()
-        for j in xrange(cnt):
+        for j in range(cnt):
             tkn = self.get_tagpath(j)
             if tkn in self.token_tags :
                 num_args = self.token_tags[tkn][0]
@@ -497,7 +498,7 @@ class PageParser(object):
             if (subtags == 1):
                 ntags = readEncodedNumber(self.fo)
                 if self.debug : print('subtags: ' + token + ' has ' + str(ntags))
-                for j in xrange(ntags):
+                for j in range(ntags):
                     val = readEncodedNumber(self.fo)
                     subtagres.append(self.procToken(self.dict.lookup(val)))
 
@@ -511,7 +512,7 @@ class PageParser(object):
                     argres = self.decodeCMD(arg,argtype)
                 else :
                     # num_arg scalar arguments
-                    for i in xrange(num_args):
+                    for i in range(num_args):
                         argres.append(self.formatArg(readEncodedNumber(self.fo), argtype))
 
             # build the return tag
@@ -546,7 +547,7 @@ class PageParser(object):
             result += 'of the document is indicated by snippet number sets at the\n'
             result += 'end of each snippet. \n'
             print(result)
-        for i in xrange(cnt):
+        for i in range(cnt):
             if self.debug: print('Snippet:',str(i))
             snippet = []
             snippet.append(i)
@@ -565,12 +566,12 @@ class PageParser(object):
             adj = readEncodedNumber(self.fo)
         mode = mode >> 1
         x = []
-        for i in xrange(cnt):
+        for i in range(cnt):
             x.append(readEncodedNumber(self.fo) - adj)
-        for i in xrange(mode):
-            for j in xrange(1, cnt):
+        for i in range(mode):
+            for j in range(1, cnt):
                 x[j] = x[j] + x[j - 1]
-        for i in xrange(cnt):
+        for i in range(cnt):
             result.append(self.formatArg(x[i],argtype))
         return result
 
@@ -844,7 +845,7 @@ def main(argv):
     try:
         opts, args = getopt.getopt(argv[1:], "hd", ["flat-xml"])
 
-    except getopt.GetoptError, err:
+    except getopt.GetoptError as err:
 
         # print help information and exit:
         print(str(err)) # will print something like "option -a not recognized"