--- a/bin/cppcms_tmpl_cc
+++ b/bin/cppcms_tmpl_cc
@@ -11,7 +11,7 @@
 import os
 import re
 import sys
-import StringIO
+from io import StringIO
 
 str_match=r'"([^"\\]|\\[^"]|\\")*"'
 single_var_param_match=r'(?:-?\d+|"(?:[^"\\]|\\[^"]|\\")*")'
@@ -64,7 +64,7 @@
 
         if namespace_name == '':
             if name == '':
-                error_ext("Skin name is not defined implicitly or explicitly")
+                error_exit("Skin name is not defined implicitly or explicitly")
             else:
                 namespace_name = name
         elif namespace_name != name and name:
@@ -1056,74 +1056,74 @@
     global inline_templates
     unsafe_build = False
     write_loader = True
-    while indx < len(os.sys.argv):
-        if os.sys.argv[indx]=='-s' or os.sys.argv[indx]=='-n' or os.sys.argv[indx]=='--skin':
-            if indx+1>=len(os.sys.argv):
-                sys.stderr.write("%s should be followed by skin name\n" % (os.sys.argv[indx]))
+    while indx < len(sys.argv):
+        if sys.argv[indx]=='-s' or sys.argv[indx]=='-n' or sys.argv[indx]=='--skin':
+            if indx+1>=len(sys.argv):
+                sys.stderr.write("%s should be followed by skin name\n" % (sys.argv[indx]))
                 help()
                 exit_flag=1
                 return
             else:
-                namespace_name=os.sys.argv[indx+1];
+                namespace_name=sys.argv[indx+1];
                 indx+=1
-        elif os.sys.argv[indx]=='-o' or os.sys.argv[indx]=='--code':
-            if indx+1>=len(os.sys.argv):
-                sys.stderr.write("%s should be followed by output file name\n" % (os.sys.argv[indx]))
+        elif sys.argv[indx]=='-o' or sys.argv[indx]=='--code':
+            if indx+1>=len(sys.argv):
+                sys.stderr.write("%s should be followed by output file name\n" % (sys.argv[indx]))
                 help()
                 exit_flag=1
                 return
             else:
-                output_file=os.sys.argv[indx+1]
+                output_file=sys.argv[indx+1]
                 indx+=1
-        elif os.sys.argv[indx]=='-I' or os.sys.argv[indx]=='-include':
-            if indx+1>=len(os.sys.argv):
-                sys.stderr.write("%s should be followed by directory name\n" % (os.sys.argv[indx]))
+        elif sys.argv[indx]=='-I' or sys.argv[indx]=='-include':
+            if indx+1>=len(sys.argv):
+                sys.stderr.write("%s should be followed by directory name\n" % (sys.argv[indx]))
                 help()
                 exit_flag=1
                 return
             else:
-                include_directory=os.sys.argv[indx+1]
+                include_directory=sys.argv[indx+1]
                 if not include_directory.endswith('/') and not include_directory.endswith('\\'):
                     include_directory=include_directory + '/';
                 indx+=1
-        elif os.sys.argv[indx]=='-H' or os.sys.argv[indx]=='--header':
-            if indx+1>=len(os.sys.argv):
-                sys.stderr.write("%s should be followed by output header file name\n" % (os.sys.argv[indx]))
+        elif sys.argv[indx]=='-H' or sys.argv[indx]=='--header':
+            if indx+1>=len(sys.argv):
+                sys.stderr.write("%s should be followed by output header file name\n" % (sys.argv[indx]))
                 help()
                 exit_flag=1
                 return
             else:
-                header_file=os.sys.argv[indx+1]
+                header_file=sys.argv[indx+1]
                 indx+=1
-        elif os.sys.argv[indx]=='-i' or os.sys.argv[indx]=='--inline-templates':
-            if indx+1>=len(os.sys.argv):
-                sys.stderr.write("%s should be followed by inline value.\n" % (os.sys.argv[indx]))
+        elif sys.argv[indx]=='-i' or sys.argv[indx]=='--inline-templates':
+            if indx+1>=len(sys.argv):
+                sys.stderr.write("%s should be followed by inline value.\n" % (sys.argv[indx]))
                 help()
                 exit_flag=1
                 return
             else:
-                inline_templates=os.sys.argv[indx+1]
+                inline_templates=sys.argv[indx+1]
                 indx+=1
-        elif os.sys.argv[indx]=='-d':
-            if indx+1>=len(os.sys.argv):
+        elif sys.argv[indx]=='-d':
+            if indx+1>=len(sys.argv):
                 sys.stderr.write("-d should followed by gettext domain name\n")
                 help()
                 exit_flag=1
                 return
             else:
                 global spec_gettext
-                spec_gettext=os.sys.argv[indx+1]
+                spec_gettext=sys.argv[indx+1]
                 indx+=1
-        elif os.sys.argv[indx]=='-u' or os.sys.argv[indx]=='--unsafe-cast':
+        elif sys.argv[indx]=='-u' or sys.argv[indx]=='--unsafe-cast':
             unsafe_build = True
-        elif os.sys.argv[indx]=='-l' or os.sys.argv[indx]=='--no-loader':
+        elif sys.argv[indx]=='-l' or sys.argv[indx]=='--no-loader':
             write_loader = False
-        elif os.sys.argv[indx]=='--help' or os.sys.argv[indx]=='-h':
+        elif sys.argv[indx]=='--help' or sys.argv[indx]=='-h':
             help()
             exit_flag=1
             return
         else:
-            all.append(os.sys.argv[indx])
+            all.append(sys.argv[indx])
         indx+=1
     if not all:
         sys.stderr.write("No input file names given\n")
@@ -1153,7 +1153,7 @@
             from hashlib import md5
         else:
             from md5 import md5
-        dll_api = 'VIEW_%s_API' % md5(header_define).hexdigest().upper()
+        dll_api = 'VIEW_%s_API' % md5(header_define.encode()).hexdigest().upper()
         
     global output_fd
     if output_file!='':
@@ -1244,8 +1244,8 @@
 scope_filter='cppcms::filters::escape'
 
 view_name = ''
-declarations = StringIO.StringIO();
-definitions = StringIO.StringIO();
+declarations = StringIO();
+definitions = StringIO();
 inline_cpp_to = output_declaration
 inline_templates = "default"
 output_template = output_definition