allow python3
diff --git a/amalgamate.py b/amalgamate.py
index 4f1c23c..5b9d220 100644
--- a/amalgamate.py
+++ b/amalgamate.py
@@ -15,36 +15,36 @@
         self.blocks = []
 
     def add_text( self, text ):
-        if not text.endswith( '\n' ):
-            text += '\n'
+        if not text.endswith( "\n" ):
+            text += "\n"
         self.blocks.append( text )
 
     def add_file( self, relative_input_path, wrap_in_comment=False ):
         def add_marker( prefix ):
-            self.add_text( '' )
-            self.add_text( '// ' + '/'*70 )
-            self.add_text( '// %s of content of file: %s' % (prefix, relative_input_path.replace('\\','/')) )
-            self.add_text( '// ' + '/'*70 )
-            self.add_text( '' )
-        add_marker( 'Beginning' )
-        f = open( os.path.join( self.top_dir, relative_input_path ), 'rt' )
+            self.add_text( "" )
+            self.add_text( "// " + "/"*70 )
+            self.add_text( "// %s of content of file: %s" % (prefix, relative_input_path.replace("\\","/")) )
+            self.add_text( "// " + "/"*70 )
+            self.add_text( "" )
+        add_marker( "Beginning" )
+        f = open( os.path.join( self.top_dir, relative_input_path ), "rt" )
         content = f.read()
         if wrap_in_comment:
-            content = '/*\n' + content + '\n*/'
+            content = "/*\n" + content + "\n*/"
         self.add_text( content )
         f.close()
-        add_marker( 'End' )
-        self.add_text( '\n\n\n\n' )
+        add_marker( "End" )
+        self.add_text( "\n\n\n\n" )
 
     def get_value( self ):
-        return ''.join( self.blocks ).replace('\r\n','\n')
+        return "".join( self.blocks ).replace("\r\n","\n")
 
     def write_to( self, output_path ):
         output_dir = os.path.dirname( output_path )
         if output_dir and not os.path.isdir( output_dir ):
             os.makedirs( output_dir )
-        f = open( output_path, 'wb' )
-        f.write( self.get_value() )
+        f = open( output_path, "wb" )
+        f.write( bytes(self.get_value(), 'UTF-8') )
         f.close()
 
 def amalgamate_source( source_top_dir=None,
@@ -56,69 +56,69 @@
            target_source_path: output .cpp path
            header_include_path: generated header path relative to target_source_path.
     """
-    print 'Amalgating header...'
+    print ("Amalgating header...")
     header = AmalgamationFile( source_top_dir )
-    header.add_text( '/// Json-cpp amalgated header (http://jsoncpp.sourceforge.net/).' )
-    header.add_text( '/// It is intented to be used with #include <%s>' % header_include_path )
-    header.add_file( 'LICENSE', wrap_in_comment=True )
-    header.add_text( '#ifndef JSON_AMALGATED_H_INCLUDED' )
-    header.add_text( '# define JSON_AMALGATED_H_INCLUDED' )
-    header.add_text( '/// If defined, indicates that the source file is amalgated' )
-    header.add_text( '/// to prevent private header inclusion.' )
-    header.add_text( '#define JSON_IS_AMALGAMATION' )
-    #header.add_file( 'include/json/version.h' )
-    header.add_file( 'include/json/config.h' )
-    header.add_file( 'include/json/forwards.h' )
-    header.add_file( 'include/json/features.h' )
-    header.add_file( 'include/json/value.h' )
-    header.add_file( 'include/json/reader.h' )
-    header.add_file( 'include/json/writer.h' )
-    header.add_file( 'include/json/assertions.h' )
-    header.add_text( '#endif //ifndef JSON_AMALGATED_H_INCLUDED' )
+    header.add_text( "/// Json-cpp amalgated header (http://jsoncpp.sourceforge.net/)." )
+    header.add_text( "/// It is intented to be used with #include <%s>" % header_include_path )
+    header.add_file( "LICENSE", wrap_in_comment=True )
+    header.add_text( "#ifndef JSON_AMALGATED_H_INCLUDED" )
+    header.add_text( "# define JSON_AMALGATED_H_INCLUDED" )
+    header.add_text( "/// If defined, indicates that the source file is amalgated" )
+    header.add_text( "/// to prevent private header inclusion." )
+    header.add_text( "#define JSON_IS_AMALGAMATION" )
+    header.add_file( "include/json/version.h" )
+    header.add_file( "include/json/config.h" )
+    header.add_file( "include/json/forwards.h" )
+    header.add_file( "include/json/features.h" )
+    header.add_file( "include/json/value.h" )
+    header.add_file( "include/json/reader.h" )
+    header.add_file( "include/json/writer.h" )
+    header.add_file( "include/json/assertions.h" )
+    header.add_text( "#endif //ifndef JSON_AMALGATED_H_INCLUDED" )
 
     target_header_path = os.path.join( os.path.dirname(target_source_path), header_include_path )
-    print 'Writing amalgated header to %r' % target_header_path
+    print ("Writing amalgated header to %r" % target_header_path)
     header.write_to( target_header_path )
 
     base, ext = os.path.splitext( header_include_path )
-    forward_header_include_path = base + '-forwards' + ext
-    print 'Amalgating forward header...'
+    forward_header_include_path = base + "-forwards" + ext
+    print ("Amalgating forward header...")
     header = AmalgamationFile( source_top_dir )
-    header.add_text( '/// Json-cpp amalgated forward header (http://jsoncpp.sourceforge.net/).' )
-    header.add_text( '/// It is intented to be used with #include <%s>' % forward_header_include_path )
-    header.add_text( '/// This header provides forward declaration for all JsonCpp types.' )
-    header.add_file( 'LICENSE', wrap_in_comment=True )
-    header.add_text( '#ifndef JSON_FORWARD_AMALGATED_H_INCLUDED' )
-    header.add_text( '# define JSON_FORWARD_AMALGATED_H_INCLUDED' )
-    header.add_text( '/// If defined, indicates that the source file is amalgated' )
-    header.add_text( '/// to prevent private header inclusion.' )
-    header.add_text( '#define JSON_IS_AMALGAMATION' )
-    header.add_file( 'include/json/config.h' )
-    header.add_file( 'include/json/forwards.h' )
-    header.add_text( '#endif //ifndef JSON_FORWARD_AMALGATED_H_INCLUDED' )
+    header.add_text( "/// Json-cpp amalgated forward header (http://jsoncpp.sourceforge.net/)." )
+    header.add_text( "/// It is intented to be used with #include <%s>" % forward_header_include_path )
+    header.add_text( "/// This header provides forward declaration for all JsonCpp types." )
+    header.add_file( "LICENSE", wrap_in_comment=True )
+    header.add_text( "#ifndef JSON_FORWARD_AMALGATED_H_INCLUDED" )
+    header.add_text( "# define JSON_FORWARD_AMALGATED_H_INCLUDED" )
+    header.add_text( "/// If defined, indicates that the source file is amalgated" )
+    header.add_text( "/// to prevent private header inclusion." )
+    header.add_text( "#define JSON_IS_AMALGAMATION" )
+    header.add_file( "include/json/config.h" )
+    header.add_file( "include/json/forwards.h" )
+    header.add_text( "#endif //ifndef JSON_FORWARD_AMALGATED_H_INCLUDED" )
 
     target_forward_header_path = os.path.join( os.path.dirname(target_source_path),
                                                forward_header_include_path )
-    print 'Writing amalgated forward header to %r' % target_forward_header_path
+    print ("Writing amalgated forward header to %r" % target_forward_header_path)
     header.write_to( target_forward_header_path )
 
-    print 'Amalgating source...'
+    print ("Amalgating source...")
     source = AmalgamationFile( source_top_dir )
-    source.add_text( '/// Json-cpp amalgated source (http://jsoncpp.sourceforge.net/).' )
-    source.add_text( '/// It is intented to be used with #include "%s"' % target_source_path )
-    source.add_file( 'LICENSE', wrap_in_comment=True )
-    source.add_text( '' )
-    source.add_text( '#include "%s"' % header_include_path )
-    source.add_text( '' )
-    lib_json = 'src/lib_json'
-    source.add_file( os.path.join(lib_json, 'json_tool.h') )
-    source.add_file( os.path.join(lib_json, 'json_reader.cpp') )
-    source.add_file( os.path.join(lib_json, 'json_batchallocator.h') )
-    source.add_file( os.path.join(lib_json, 'json_valueiterator.inl') )
-    source.add_file( os.path.join(lib_json, 'json_value.cpp') )
-    source.add_file( os.path.join(lib_json, 'json_writer.cpp') )
+    source.add_text( "/// Json-cpp amalgated source (http://jsoncpp.sourceforge.net/)." )
+    source.add_text( "/// It is intented to be used with #include <%s>" % header_include_path )
+    source.add_file( "LICENSE", wrap_in_comment=True )
+    source.add_text( "" )
+    source.add_text( "#include <%s>" % header_include_path )
+    source.add_text( "" )
+    lib_json = "src/lib_json"
+    source.add_file( os.path.join(lib_json, "json_tool.h") )
+    source.add_file( os.path.join(lib_json, "json_reader.cpp") )
+    source.add_file( os.path.join(lib_json, "json_batchallocator.h") )
+    source.add_file( os.path.join(lib_json, "json_valueiterator.inl") )
+    source.add_file( os.path.join(lib_json, "json_value.cpp") )
+    source.add_file( os.path.join(lib_json, "json_writer.cpp") )
 
-    print 'Writing amalgated source to %r' % target_source_path
+    print ("Writing amalgated source to %r" % target_source_path)
     source.write_to( target_source_path )
 
 def main():
@@ -128,11 +128,11 @@
     from optparse import OptionParser
     parser = OptionParser(usage=usage)
     parser.allow_interspersed_args = False
-    parser.add_option('-s', '--source', dest="target_source_path", action='store', default='dist/jsoncpp.cpp',
+    parser.add_option("-s", "--source", dest="target_source_path", action="store", default="dist/jsoncpp.cpp",
         help="""Output .cpp source path. [Default: %default]""")
-    parser.add_option('-i', '--include', dest="header_include_path", action='store', default='json/json.h',
+    parser.add_option("-i", "--include", dest="header_include_path", action="store", default="json/json.h",
         help="""Header include path. Used to include the header from the amalgated source file. [Default: %default]""")
-    parser.add_option('-t', '--top-dir', dest="top_dir", action='store', default=os.getcwd(),
+    parser.add_option("-t", "--top-dir", dest="top_dir", action="store", default=os.getcwd(),
         help="""Source top-directory. [Default: %default]""")
     parser.enable_interspersed_args()
     options, args = parser.parse_args()
@@ -141,10 +141,10 @@
                              target_source_path=options.target_source_path,
                              header_include_path=options.header_include_path )
     if msg:
-        sys.stderr.write( msg + '\n' )
+        sys.stderr.write( msg + "\n" )
         sys.exit( 1 )
     else:
-        print 'Source succesfully amalagated'
- 
-if __name__ == '__main__':
+        print ("Source succesfully amalagated")
+
+if __name__ == "__main__":
     main()