additional fixes for python3

bindings/python/example_scripts/account_analysis.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # account_analysis.py -- Output all the credits and debits on an account
 #

bindings/python/example_scripts/change_tax_code.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 ##  @file
 #   @brief Output all the credits and debits on an account

bindings/python/example_scripts/gncinvoicefkt.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 ##@file

bindings/python/example_scripts/latex_invoices.py

@@ -179,7 +179,7 @@ def main(argv=None):
 
         try:
             opts, args = getopt.getopt(argv[1:], "fhiln:po:", ["help"])
-        except getopt.error, msg:
+        except getopt.error as msg:
              raise Usage(msg)
 
         for opt in opts:
@@ -207,12 +207,12 @@ def main(argv=None):
         if len(args)==0:
             raise Usage("No input given !")
         input_url = args[0]
-    except Usage, err:
+    except Usage as err:
         if err.msg == "Help:":
             retcode=0
         else:
-            print(>>sys.stderr, "Error:",err.msg)
-            print(>>sys.stderr, "for help use --help")
+            print("Error:", err.msg, file=sys.stderr)
+            print("for help use --help", file=sys.stderr)
             retcode=2
 
         print("Generate a LaTeX invoice or print out all invoices.")

bindings/python/example_scripts/test_imbalance_transaction.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # test_imbalance_transaction.py -- Test the transaction imbalace viewing
 # mechanisms