diff --git a/preprocessed/boost_mpl_preprocess.py b/preprocessed/boost_mpl_preprocess.py
index b497391..d9fbd03 100755
--- a/preprocessed/boost_mpl_preprocess.py
+++ b/preprocessed/boost_mpl_preprocess.py
@@ -118,6 +118,11 @@ def to_existing_absolute_path(string):
 def main():
     """The main function."""
     
+    # Determine the currently running python executable.
+    python_executable = sys.executable
+    if python_executable == None or python_executable == "":
+        python_executable = python
+    
     # Find the current Boost source-directory in which this script is located.
     sourceDir = current_boost_dir()
     if sourceDir == None:
@@ -150,19 +155,19 @@ def main():
 
     # Some verbose debug output.
     if args.verbose:
-        print "Arguments extracted from command-line:"
-        print "  verbose          = ", args.verbose
-        print "  source directory = ", args.sourceDir
-        print "  num elements     = ", args.numElements
-        print "  sequence type    = ", args.seqType
-        print "  want: vector     = ", args.want_vector
-        print "  want: list       = ", args.want_list
-        print "  want: set        = ", args.want_set
-        print "  want: map        = ", args.want_map
+        print("Arguments extracted from command-line:")
+        print("  verbose          = ", args.verbose)
+        print("  source directory = ", args.sourceDir)
+        print("  num elements     = ", args.numElements)
+        print("  sequence type    = ", args.seqType)
+        print("  want: vector     = ", args.want_vector)
+        print("  want: list       = ", args.want_list)
+        print("  want: set        = ", args.want_set)
+        print("  want: map        = ", args.want_map)
 
     # Verify that we received any source-directory.
     if args.sourceDir == None:
-        print "You should specify a valid path to the Boost source-directory."
+        print("You should specify a valid path to the Boost source-directory.")
         sys.exit(0)
 
     # The directories for header- and source files of Boost.MPL.
@@ -177,13 +182,13 @@ def main():
         sourceDir = os.path.join( args.sourceDir, "preprocessed" )
         if not os.path.exists( headerDir ) or not os.path.exists( sourceDir ):
             cmdlineParser.print_usage()
-            print "error: Cannot find Boost.MPL header/source files in given Boost source-directory!"
+            print("error: Cannot find Boost.MPL header/source files in given Boost source-directory!")
             sys.exit(0)
 
     # Some verbose debug output.
     if args.verbose:
-        print "Chosen header-directory: ", headerDir
-        print "Chosen source-directory: ", sourceDir
+        print("Chosen header-directory: ", headerDir)
+        print("Chosen source-directory: ", sourceDir)
 
     # Create list of containers for which files shall be pre-processed.
     containers = []
@@ -196,23 +201,23 @@ def main():
     if args.want_map:
         containers.append('map')
     if containers == []:
-        print "Nothing to do."
-        print "(Why did you prevent generating pre-processed headers for all Boost.MPL container types?)"
+        print("Nothing to do.")
+        print("(Why did you prevent generating pre-processed headers for all Boost.MPL container types?)")
         sys.exit(0)
 
     # Possibly fix the header-comments of input-files needed for pre-processing.
     if args.verbose:
-        print "Checking if prior to pre-processing some input-files need fixing."
+        print("Checking if prior to pre-processing some input-files need fixing.")
     needFixing = fixmpl.check_input_files(headerDir, sourceDir, containers, args.seqType, args.verbose)
     if needFixing:
         if args.verbose:
-            print "Fixing of some input-files prior to pre-processing is needed."
-            print "Will fix them now!"
+            print("Fixing of some input-files prior to pre-processing is needed.")
+            print("Will fix them now!")
         fixmpl.fix_input_files(headerDir, sourceDir, containers, args.seqType, args.verbose)
 
     # Some verbose debug output.
     if args.verbose:
-        print "Containers for which to pre-process headers: ", containers
+        print("Containers for which to pre-process headers: ", containers)
 
     # Create (additional) input files for generating pre-processed headers of numbered sequence MPL containers.
     if args.seqType == "both" or args.seqType == "numbered":
@@ -226,24 +231,24 @@ def main():
     if args.seqType == "both" or args.seqType == "numbered":
         if args.want_vector:
             if args.verbose:
-                print "Pre-process headers for Boost.MPL numbered vectors."
-            os.system( "python " + os.path.join( sourceDir, "preprocess_vector.py" ) + " all " + args.sourceDir )
+                print("Pre-process headers for Boost.MPL numbered vectors.")
+            os.system( python_executable + " " + os.path.join( sourceDir, "preprocess_vector.py" ) + " all " + args.sourceDir )
         if args.want_list:
             if args.verbose:
-                print "Pre-process headers for Boost.MPL numbered lists."
-            os.system( "python " + os.path.join( sourceDir, "preprocess_list.py" ) + " all " + args.sourceDir )
+                print("Pre-process headers for Boost.MPL numbered lists.")
+            os.system( python_executable + " " + os.path.join( sourceDir, "preprocess_list.py" ) + " all " + args.sourceDir )
         if args.want_set:
             if args.verbose:
-                print "Pre-process headers for Boost.MPL numbered sets."
-            os.system( "python " + os.path.join( sourceDir, "preprocess_set.py" ) + " all " + args.sourceDir )
+                print("Pre-process headers for Boost.MPL numbered sets.")
+            os.system( python_executable + " " + os.path.join( sourceDir, "preprocess_set.py" ) + " all " + args.sourceDir )
         if args.want_map:
             if args.verbose:
-                print "Pre-process headers for Boost.MPL numbered maps."
-            os.system( "python " + os.path.join( sourceDir, "preprocess_map.py" ) + " all " + args.sourceDir )
+                print("Pre-process headers for Boost.MPL numbered maps.")
+            os.system( python_executable + " " + os.path.join( sourceDir, "preprocess_map.py" ) + " all " + args.sourceDir )
     if args.seqType == "both" or args.seqType == "variadic":
         if args.verbose:
-            print "Pre-process headers for Boost.MPL variadic containers."
-        os.system( "python " + os.path.join( sourceDir, "preprocess.py" ) + " all " + args.sourceDir )
+            print("Pre-process headers for Boost.MPL variadic containers.")
+        os.system( python_executable + " " + os.path.join( sourceDir, "preprocess.py" ) + " all " + args.sourceDir )
 
 
 if __name__ == '__main__':
diff --git a/preprocessed/fix_boost_mpl_preprocess.py b/preprocessed/fix_boost_mpl_preprocess.py
index 3b92d25..ab1857c 100755
--- a/preprocessed/fix_boost_mpl_preprocess.py
+++ b/preprocessed/fix_boost_mpl_preprocess.py
@@ -66,26 +66,26 @@ def check_input_files(headerDir, sourceDir, containers=['vector', 'list', 'set',
     result1 = False
     if seqType == "both" or seqType == "variadic":
         if verbose:
-            print "Check if input files for pre-processing Boost.MPL variadic containers need fixing."
+            print("Check if input files for pre-processing Boost.MPL variadic containers need fixing.")
         result1 = check_input_files_for_variadic_seq(headerDir, sourceDir)
         if verbose:
             if result1:
-                print "  At least one input file needs fixing!"
+                print("  At least one input file needs fixing!")
             else:
-                print "  No input file needs fixing!"
+                print("  No input file needs fixing!")
     # Check the input files for containers in their numbered form.
     result2 = False
     result3 = False
     if seqType == "both" or seqType == "numbered":
         if verbose:
-            print "Check input files for pre-processing Boost.MPL numbered containers."
+            print("Check input files for pre-processing Boost.MPL numbered containers.")
         result2 = check_input_files_for_numbered_seq(headerDir, ".hpp", containers)
         result3 = check_input_files_for_numbered_seq(sourceDir, ".cpp", containers)
         if verbose:
             if result2 or result3:
-                print "  At least one input file needs fixing!"
+                print("  At least one input file needs fixing!")
             else:
-                print "  No input file needs fixing!"
+                print("  No input file needs fixing!")
     # Return result.
     return result1 or result2 or result3
 
@@ -128,12 +128,12 @@ def fix_input_files(headerDir, sourceDir, containers=['vector', 'list', 'set', '
     # Fix the input files for containers in their variadic form.
     if seqType == "both" or seqType == "variadic":
         if verbose:
-            print "Fix input files for pre-processing Boost.MPL variadic containers."
+            print("Fix input files for pre-processing Boost.MPL variadic containers.")
         fix_input_files_for_variadic_seq(headerDir, sourceDir, timestamp)
     # Fix the input files for containers in their numbered form.
     if seqType == "both" or seqType == "numbered":
         if verbose:
-            print "Fix input files for pre-processing Boost.MPL numbered containers."
+            print("Fix input files for pre-processing Boost.MPL numbered containers.")
         fix_input_files_for_numbered_seq(headerDir, ".hpp", timestamp, containers)
         fix_input_files_for_numbered_seq(sourceDir, ".cpp", timestamp, containers)
 
@@ -164,10 +164,10 @@ def main():
 
     # Some verbose debug output.
     if args.verbose:
-        print "Arguments extracted from command-line:"
-        print "  verbose           = ", args.verbose
-        print "  check-only        = ", args.checkonly
-        print "  source directory  = ", args.sourceDir
+        print("Arguments extracted from command-line:")
+        print("  verbose           = ", args.verbose)
+        print("  check-only        = ", args.checkonly)
+        print("  source directory  = ", args.sourceDir)
 
     # The directories for header- and source files of Boost.MPL.    
     # NOTE: Assuming 'args.sourceDir' is the source-directory of the entire boost project.
@@ -181,21 +181,21 @@ def main():
         sourceDir = os.path.join( args.sourceDir, "preprocessed" )
         if not os.path.exists( headerDir ) or not os.path.exists( sourceDir ):
             cmdlineParser.print_usage()
-            print "error: Cannot find Boost.MPL header/source files in given Boost source-directory!"
+            print("error: Cannot find Boost.MPL header/source files in given Boost source-directory!")
             sys.exit(0)
 
     # Some verbose debug output.
     if args.verbose:
-        print "Chosen header-directory: ", headerDir
-        print "Chosen source-directory: ", sourceDir
+        print("Chosen header-directory: ", headerDir)
+        print("Chosen source-directory: ", sourceDir)
 
     if args.checkonly:
         # Check input files for generating pre-processed headers.
         result = check_input_files(headerDir, sourceDir, verbose = args.verbose)
         if result:
-            print "Fixing the input-files used for pre-processing of Boost.MPL headers IS required."
+            print("Fixing the input-files used for pre-processing of Boost.MPL headers IS required.")
         else:
-            print "Fixing the input-files used for pre-processing of Boost.MPL headers is NOT required."
+            print("Fixing the input-files used for pre-processing of Boost.MPL headers is NOT required.")
     else:
         # Fix input files for generating pre-processed headers.
         fix_input_files(headerDir, sourceDir, verbose = args.verbose)
diff --git a/preprocessed/pp.py b/preprocessed/pp.py
index 24bfd27..25a7717 100644
--- a/preprocessed/pp.py
+++ b/preprocessed/pp.py
@@ -12,6 +12,7 @@
 # $Revision$
 
 import fileinput
+import functools
 import os
 import re
 import string
@@ -22,22 +23,21 @@ max_len = 79
 ident = 4
 
 def nearest_ident_pos(text):
-    return (len(text)/ident) * ident
+    return int((len(text)/ident) * ident)
     
 def block_format(limits, text, first_sep='  ', sep=',', need_last_ident=1 ):
-    if sep == ',' and string.find( text, '<' ) != -1:
+    if sep == ',' and str.find( text, '<' ) != -1:
         sep = '%s ' % sep
     
-    words = string.split(
-          string.join( string.split( text ), ' ' )
+    words = str.split(
+          ' '.join( str.split( text ) )
         , sep
         )
-
     s = ' ' * limits[0]
     max_len = limits[1]
     return '%s\n%s' \
         % (
-         reduce(
+         functools.reduce(
             lambda t,w,max_len=max_len,s=s,sep=sep:
                 if_else(t[1] + len(w) < max_len
                     , ('%s%s%s'% (t[0],t[2],w), t[1]+len(w)+len(t[2]), sep)
@@ -52,7 +52,6 @@ def block_format(limits, text, first_sep='  ', sep=',', need_last_ident=1 ):
 def handle_args( match ):
     if re.compile('^\s*(typedef|struct|static)\s+.*?$').match(match.group(0)):
         return match.group(0)
-    
     return '%s'\
         % block_format(
               (nearest_ident_pos(match.group(1)),max_len)
@@ -86,7 +85,7 @@ def handle_inline_args(match):
                  (nearest_ident_pos(match.group(1))+ident,max_len-len(match.group(9)))
                 , match.group(4)
                 )
-            , string.replace(match.group(1),',',' ')
+            , str.replace(match.group(1),',',' ')
             , match.group(9)
           )
 
@@ -98,18 +97,18 @@ def handle_simple_list(match):
     return if_else(single_arg,'%s<%s>','%s< %s >') %\
         (
           match.group(1)
-        , string.join(string.split(match.group(2)), '')
+        , ''.join(str.split(match.group(2)))
         )
 
 def handle_static(match):
     if len(match.group(0)) < max_len:
         return match.group(0)
 
-    (first_sep,sep) = if_else(string.find(match.group(0),'+') == -1, (' ',' '),('  ','+'))
+    (first_sep,sep) = if_else(str.find(match.group(0),'+') == -1, (' ',' '),('  ','+'))
     return '%s%s\n%s%s' %\
         (
           match.group(1)
-        , string.join(string.split(match.group(2)), ' ')
+        , ' '.join(str.split(match.group(2)))
         , block_format(
               (nearest_ident_pos(match.group(1))+ident,max_len)
             , match.group(4)
@@ -120,7 +119,7 @@ def handle_static(match):
         )
 
 def handle_typedefs(match):
-    if string.count(match.group(2), ';') == 1:
+    if str.count(match.group(2), ';') == 1:
         return match.group(0)
 
     join_sep = ';\n%s' % match.group(1)
@@ -128,7 +127,7 @@ def handle_typedefs(match):
     return '%s%s\n' \
         % (
             match.group(1)
-          , string.join(map(string.strip, string.split(match.group(2), ';')), join_sep)
+          , join_sep.join(list(map(str.strip, str.split(match.group(2), ';')))) 
           )
 
 def fix_angle_brackets( match ):
diff --git a/preprocessed/preprocess.py b/preprocessed/preprocess.py
index 0c38eb0..6c87352 100644
--- a/preprocessed/preprocess.py
+++ b/preprocessed/preprocess.py
@@ -57,10 +57,10 @@ def process_all( root, boost_root, dst_dir, mode ):
 
 def main( all_modes, src_dir, dst_dir ):
     if len( sys.argv ) < 2:
-        print "\nUsage:\n\t %s <mode> <boost_root> [<source_file>]" % os.path.basename( sys.argv[0] )
-        print "\nPurpose:\n\t updates preprocessed version(s) of the header(s) in \"%s\" directory" % dst_dir
-        print "\nExample:\n\t the following command will re-generate and update all 'apply.hpp' headers:"
-        print "\n\t\t %s all f:\\cvs\\boost apply.cpp" % os.path.basename( sys.argv[0] )
+        print("\nUsage:\n\t %s <mode> <boost_root> [<source_file>]" % os.path.basename( sys.argv[0] ))
+        print("\nPurpose:\n\t updates preprocessed version(s) of the header(s) in \"%s\" directory" % dst_dir)
+        print("\nExample:\n\t the following command will re-generate and update all 'apply.hpp' headers:")
+        print("\n\t\t %s all f:\\cvs\\boost apply.cpp" % os.path.basename( sys.argv[0] ))
         sys.exit( -1 )
 
     if sys.argv[1] == "all":