Merge pull request #13 from Multiscale-Genomics/python3_compatible

changing file() function to open() function

apps/jsonapp.py

@@ -129,7 +129,7 @@ def _read_config(self, json_path):  # pylint: disable=no-self-use
 
         For more information see the schema for config.json.
         """
-        configuration = json.load(file(json_path))
+        configuration = json.load(open(json_path))
         input_ids = {}
         for input_config_id in configuration["input_files"]:
             role = input_config_id["name"]
@@ -159,7 +159,7 @@ def _read_metadata(self, json_path):  # pylint: disable=no-self-use
 
         For more information see the schema for input_metadata.json.
         """
-        metadata = json.load(file(json_path))
+        metadata = json.load(open(json_path))
         input_metadata = {}
         for input_file in metadata:
             input_id = input_file["_id"]
@@ -228,6 +228,6 @@ def _newresult(role, path, metadata):
                 results.append(
                     _newresult(role, path, metadata))
         json.dump(
-            {"output_files": results}, file(json_path, 'w'),
+            {"output_files": results}, open(json_path, 'w'),
             indent=4, separators=(',', ': '))
         return True