--- convert2_3.py (original)
+++ convert2_3.py (refactored)
@@ -9,8 +9,8 @@
         outfile.write(data)
         outfile.close()
 
-    except StandardError, e:
-        print e
+    except Exception as e:
+        print(e)
 
 def read_file(filename): 
     infile = file(filename, "rb")
@@ -19,24 +19,24 @@
     major_version = int(file_version[0])
     minor_version = int(file_version[2])
     
-    if major_version <> 1 or minor_version > 5:
-        raise Exception, "Wrong file version"
+    if major_version != 1 or minor_version > 5:
+        raise Exception("Wrong file version")
 
     infile.close()
     return file_version, data
 
 if __name__ == "__main__":
     version = "1.1"
-    filename = raw_input("Please enter a filename: ")
+    filename = input("Please enter a filename: ")
     write_file(filename, version, "this is test data")
-    print "File created, reading data from file"
+    print("File created, reading data from file")
     new_version, data = read_file(filename)
-    cents = 73L
+    cents = 73
     quarters = cents / 25
-    print "%s cents contains %s quarters" % (cents, quarters)
+    print("%s cents contains %s quarters" % (cents, quarters))
 
     new_dict = {}
-    if not new_dict.has_key(new_version):
+    if new_version not in new_dict:
         new_dict[new_version] = filename