Fix issues related to Python 3 compatibility

build.py

@@ -336,7 +336,9 @@ class Gen_compressed(threading.Thread):
     conn = httplib.HTTPSConnection("closure-compiler.appspot.com")
     conn.request("POST", "/compile", urlencode(params), headers)
     response = conn.getresponse()
-    json_str = response.read()
+
+    # Decode is necessary for Python 3.4 compatibility
+    json_str = response.read().decode("utf-8")
     conn.close()
 
     # Parse the JSON response.
@@ -456,7 +458,7 @@ class Gen_langfiles(threading.Thread):
           # If a destination file was missing, rebuild.
           return True
       else:
-        print("Error checking file creation times: " + e)
+        print("Error checking file creation times: " + str(e))
 
   def run(self):
     # The files msg/json/{en,qqq,synonyms}.json depend on msg/messages.js.

i18n/create_messages.py

@@ -87,7 +87,7 @@ def main():
   # Read in synonyms file, which must be output in every language.
   synonym_defs = read_json_file(os.path.join(
       os.curdir, args.source_synonym_file))
-  
+
   # synonym_defs is also being sorted to ensure the same order is kept
   synonym_text = '\n'.join([u'Blockly.Msg["{0}"] = Blockly.Msg["{1}"];'
       .format(key, synonym_defs[key]) for key in sorted(synonym_defs)])

i18n/dedup_json.py

@@ -51,9 +51,9 @@ def main():
     try:
       with codecs.open(filename, 'r', 'utf-8') as infile:
         j = json.load(infile)
-    except ValueError, e:
+    except ValueError as e:
       print('Error reading ' + filename)
-      raise InputError(file, str(e))
+      raise InputError(filename, str(e))
 
     # Built up output strings as an array to make output of delimiters easier.
     output = []

i18n/json_to_js.py

@@ -100,7 +100,7 @@ def _process_file(path_to_json, target_lang, key_dict):
         if key != '@metadata':
             try:
                 identifier = key_dict[key]
-            except KeyError, e:
+            except KeyError as e:
                 print('Key "%s" is in %s but not in %s' %
                       (key, keyfile, args.key_file))
                 raise e

i18n/tests.py

@@ -37,7 +37,7 @@ class TestSequenceFunctions(unittest.TestCase):
                  u'block of actions.']
     for sentence in sentences:
       output = common.insert_breaks(sentence, 30, 50)
-      self.assert_(contains_all_chars(sentence, output),
+      self.assertTrue(contains_all_chars(sentence, output),
                    u'Mismatch between:\n{0}\n{1}'.format(
                        re.sub(spaces, '', sentence),
                        re.sub(spaces, '', output)))

i18n/xliff_to_json.py

@@ -65,7 +65,7 @@ def _parse_trans_unit(trans_unit):
     try:
         result['source'] = get_value('source')
         result['target'] = get_value('target')
-    except InputError, e:
+    except InputError as e:
         raise InputError(key, e.msg)
 
     # Get notes, using the from value as key and the data as value.
@@ -112,8 +112,8 @@ def _process_file(filename):
         except IOError:
             # Don't get caught by below handler
             raise
-        except Exception, e:
-            print
+        except Exception as e:
+            print()
             raise InputError(filename, str(e))
 
         # Make sure needed fields are present and non-empty.
@@ -146,8 +146,8 @@ def _process_file(filename):
               results.append(unit)
 
         return results
-    except IOError, e:
-        print 'Error with file {0}: {1}'.format(filename, e.strerror)
+    except IOError as e:
+        print('Error with file {0}: {1}'.format(filename, e.strerror))
         sys.exit(1)