diff --git a/Documentation/doc/CMakeLists.txt b/Documentation/doc/CMakeLists.txt
index 81c78f42f15..a5a71672903 100644
--- a/Documentation/doc/CMakeLists.txt
+++ b/Documentation/doc/CMakeLists.txt
@@ -25,7 +25,7 @@ else()
 endif()
 
 find_package(Doxygen)
-find_package(PythonInterp 2.6.7)
+find_package(PythonInterp 3.5)
 
 if(NOT DOXYGEN_FOUND)
   message(WARNING "Cannot build the documentation without Doxygen!")
diff --git a/Documentation/doc/scripts/compare_testsuites.sh b/Documentation/doc/scripts/compare_testsuites.sh
index 1c5a594ce1b..0181e8166cc 100644
--- a/Documentation/doc/scripts/compare_testsuites.sh
+++ b/Documentation/doc/scripts/compare_testsuites.sh
@@ -28,7 +28,7 @@ FAILURES=()
 for dir in $PATH_TO_DOC/*
 do
   OUTPUT=$(basename $dir)
-  python ../documentation_parser.py $dir/xml > ./"$OUTPUT.txt"
+  python3 ../documentation_parser.py $dir/xml > ./"$OUTPUT.txt"
   if [ $? -eq 0 ]; then
     echo "$dir OK"
   else
diff --git a/Documentation/doc/scripts/documentation_parser.py b/Documentation/doc/scripts/documentation_parser.py
index 187b175bf4f..337070326b7 100644
--- a/Documentation/doc/scripts/documentation_parser.py
+++ b/Documentation/doc/scripts/documentation_parser.py
@@ -2,6 +2,7 @@ from pyquery import PyQuery as pq
 from collections import defaultdict
 from sys import argv 
 import os.path as op
+import codecs
 
 # if _in is part of args, return true.
 def check_type(_in, args):
@@ -12,17 +13,17 @@ def check_type(_in, args):
 
 root_path=argv[1]
 d = pq(filename=op.join(op.sep, root_path,'index.xml'), parser="xml")
-compounds=[p.text() for p in d('compound').items()]
-types=[p.attr('kind') for p in d('compound').items()]
+compounds=[p.text() for p in list(d('compound').items())]
+types=[p.attr('kind') for p in list(d('compound').items())]
 type_map = defaultdict(list) #map <type, name>
 dict_map = defaultdict(dict)#map <name, map<member type, member name>>
 #FOREACH compounds : fill maps
-for i in xrange(0,len(compounds)):
+for i in range(0,len(compounds)):
   if check_type(types[i], "typedef"):
     types[i]="type"
   name=d('compound').children("name").eq(i).text()
-  members=[p.text() for p in d('compound').eq(i).children("member").items()]
-  m_types=[p.attr('kind') for p in d('compound').eq(i).children("member").items()]
+  members=[p.text() for p in list(d('compound').eq(i).children("member").items())]
+  m_types=[p.attr('kind') for p in list(d('compound').eq(i).children("member").items())]
   if (not check_type(types[i], ['example', 'file', 'dir', 'page', 'group']) and
       not (types[i] == "namespace" and len(members) == 0) and
       not (types[i] == "enum" and len(members) == 0) ):
@@ -31,8 +32,9 @@ for i in xrange(0,len(compounds)):
       filepath='class'+compound+'.xml'
       total_path=op.join(op.sep, root_path,filepath)
       if(op.isfile(total_path)):
-        e = pq(filename=total_path, parser="xml")
-        compoundnames=[p.text() for p in e('includes').items()]
+        file_content = codecs.open(total_path, 'r', encoding='utf-8')
+        e = pq(file_content, parser="xml")
+        compoundnames=[p.text() for p in list(e('includes').items())]
         
         if(len(compoundnames) > 1 and compoundnames[0].find("Concept") != -1):
           types[i] = 'Concept '+types[i].lower()
@@ -41,7 +43,7 @@ for i in xrange(0,len(compounds)):
     mtype_map = defaultdict(list)# map<member type, member name>
 
     #FOREACH member :
-    for j in xrange(0,len(members)):
+    for j in range(0,len(members)):
       if(check_type(types[i], ['class', 'Concept class'])
          and m_types[j] == "function"):
         m_types[j]="method"
@@ -62,7 +64,7 @@ for btype in type_map:
   out=btype
   if btype.endswith('s'):
     out+='e'
-  print out.title()+'s'
+  print(out.title()+'s')
   indent+="  "
   #FOREACH name
   for name in type_map[btype]:
@@ -74,7 +76,7 @@ for btype in type_map:
     templates=[]
     if op.isfile(op.join(op.sep, root_path,filepath)):
       f=pq(filename=op.join(op.sep, root_path,filepath), parser="xml")
-      templateparams=f("compounddef").children("templateparamlist").eq(0).children("param").items()
+      templateparams=list(f("compounddef").children("templateparamlist").eq(0).children("param").items())
       for param in templateparams:
         template_type=""
         template_name=""
@@ -91,7 +93,7 @@ for btype in type_map:
           complete_template+=' = '+template_defval
         templates.append(complete_template)        
         if templates==[]:#if no child was found, just take param.text()
-         templates=[t.text() for t in param.items()]
+         templates=[t.text() for t in list(param.items())]
     suffix="<"
     #as template got type, defname and declname, name is twice in template. keep only one of them.
     to_remove=[""]
@@ -101,7 +103,7 @@ for btype in type_map:
       suffix=""
     if suffix.endswith(', '):
       suffix = suffix[:-2]+'>'
-    print indent+name+suffix
+    print(indent+name+suffix)
 
     indent+="  "
     #FOREACH mtype
@@ -109,7 +111,7 @@ for btype in type_map:
       out=mtype
       if mtype.endswith('s'):
         out+='e'
-      print indent+out.title()+'s'
+      print(indent+out.title()+'s')
       indent+="  "
       #FOREACH member
       overload_map = defaultdict(int) #contains the number of times a member has appeared (to manage the overloads)
@@ -123,16 +125,16 @@ for btype in type_map:
         if op.isfile(op.join(op.sep, root_path,filepath)):
           f=pq(filename=op.join(op.sep, root_path,filepath), parser="xml")
           index=0
-          memberdefs=[m.text() for m in f("memberdef").items()]
-          for i in xrange(0,len(memberdefs)):
-            member_names=[member_name.text() for member_name in f('memberdef').eq(i).children("name").items()]
+          memberdefs=[m.text() for m in list(f("memberdef").items())]
+          for i in range(0,len(memberdefs)):
+            member_names=[member_name.text() for member_name in list(f('memberdef').eq(i).children("name").items())]
             if f('memberdef').eq(i).children("name").text() == member:
               if (index < overload_map[member]):
                 index+=1
               elif (index == overload_map[member]):
                 if check_type(mtype, ['function', 'method']):
                   args=[f('memberdef').eq(i).children("argsstring").text()]
-                  templateparams=f('memberdef').eq(i).children("templateparamlist").children("param").items()
+                  templateparams=list(f('memberdef').eq(i).children("templateparamlist").children("param").items())
                 if check_type(mtype, ['function', 'method', 'type', 'variable']):
                   return_type=[f('memberdef').eq(i).children("type").text()]
                 break;
@@ -158,7 +160,7 @@ for btype in type_map:
             complete_template+=' = '+template_defval
           templates.append(complete_template)        
           if templates==[]:#if no child was found, just take param.text()
-           templates=[t.text() for t in param.items()]
+           templates=[t.text() for t in list(param.items())]
 
         prefix="template <"
         for template in templates:
@@ -171,7 +173,7 @@ for btype in type_map:
           prefix+=definition
         if(prefix != ""):
           prefix+=" "
-        print indent+prefix+member+arguments
+        print(indent+prefix+member+arguments)
         overload_map[member]+=1
       #END foreach member
       indent=indent[:-2]
diff --git a/Documentation/doc/scripts/generate_how_to_cite.py b/Documentation/doc/scripts/generate_how_to_cite.py
index caad53d6392..c5faae7a5ba 100644
--- a/Documentation/doc/scripts/generate_how_to_cite.py
+++ b/Documentation/doc/scripts/generate_how_to_cite.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # coding: utf8
 
 import re
@@ -157,7 +157,7 @@ def protect_upper_case(title):
   return title.replace("dD","{dD}").replace("2D","{2D}").replace("3D","{3D}").replace("CGAL","{CGAL}").replace("Qt","{Qt}").replace("Boost","{Boost}")
 
 def protect_accentuated_letters(authors):
-  res=authors.replace(u"é",r"{\'e}").replace(u"è",r"{\`e}").replace(u"É",r"{\'E}").replace(u"ä",r"{\"a}").replace(u"ö",r"{\"o}").replace(u"ñ",r"{\~n}").replace(u"ã",r"{\~a}").replace(u"ë",r"{\"e}").replace(u"ı",r"{\i}").replace(u"Ş",r"{\c{S}}").replace(u"ş",r"{\c{s}}").replace("%","")
+  res=authors.replace("é",r"{\'e}").replace("è",r"{\`e}").replace("É",r"{\'E}").replace("ä",r"{\"a}").replace("ö",r"{\"o}").replace("ñ",r"{\~n}").replace("ã",r"{\~a}").replace("ë",r"{\"e}").replace("ı",r"{\i}").replace("Ş",r"{\c{S}}").replace("ş",r"{\c{s}}").replace("%","")
   try:
     res.encode('ascii')
   except UnicodeEncodeError:
diff --git a/Documentation/doc/scripts/html_output_post_processing.py b/Documentation/doc/scripts/html_output_post_processing.py
index 30d59dbc772..b7a097383f4 100755
--- a/Documentation/doc/scripts/html_output_post_processing.py
+++ b/Documentation/doc/scripts/html_output_post_processing.py
@@ -62,7 +62,7 @@ def write_out_html(d, fn):
     f.close()
 
 def package_glob(target):
-    return filter(lambda x: not os.path.join(os.path.join('.','Manual'),'')  in x, glob.glob(target))
+    return [x for x in glob.glob(target) if not os.path.join(os.path.join('.','Manual'),'')  in x]
 
 # remove duplicate files
 def clean_doc():
diff --git a/Documentation/doc/scripts/process_doc.sh b/Documentation/doc/scripts/process_doc.sh
index 0b9d2e2be89..f7f442fe6f5 100644
--- a/Documentation/doc/scripts/process_doc.sh
+++ b/Documentation/doc/scripts/process_doc.sh
@@ -45,7 +45,7 @@ mv diff.txt diff2.txt
 
 #update overview
 CGAL_NAME=$(cat cgal_version)
-python ${PWD}/testsuite.py --output-dir1 $PWD/doc_1_8_4/doc_output/ --output-dir2 $PWD/doc_1_8_13/doc_output/ --doc-log-dir1 $PWD/doc_1_8_4/doc_log/ \
+python3 ${PWD}/testsuite.py --output-dir1 $PWD/doc_1_8_4/doc_output/ --output-dir2 $PWD/doc_1_8_13/doc_output/ --doc-log-dir1 $PWD/doc_1_8_4/doc_log/ \
   --doc-log-dir2 $PWD/doc_1_8_13/doc_log/ --doc-log-dir-master $PWD/doc_master/doc_log/ \
   --publish $PUBLISH_DIR --diff1 $PWD/diff1.txt --diff2 $PWD/diff2.txt --master-dir $PWD/doc_master/doc_output/ \
   --cgal-version "$CGAL_NAME" --do-copy-results --version-to-keep 10 --doxygen-version1 "$DOXYGEN_1" --doxygen-version2 "$DOXYGEN_2" --master-describe "$MASTER_DESCRIBE"
diff --git a/Documentation/doc/scripts/testsuite.py b/Documentation/doc/scripts/testsuite.py
index 1fda305b1e0..b1c70b65b39 100755
--- a/Documentation/doc/scripts/testsuite.py
+++ b/Documentation/doc/scripts/testsuite.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # Copyright (c) 2012 GeometryFactory (France). All rights reserved.
 # All rights reserved.
 #