Py3 compatibility

This merge request fixes the code to run with both Python 2 an Python 3

beat/core/execution/base.py

@@ -187,14 +187,14 @@ class BaseExecutor(object):
         if len(self.data['inputs']) != len(self.algorithm.input_map):
             self.errors.append("The number of inputs of the algorithm doesn't correspond")
 
-        if self.data.has_key('outputs') and (len(self.data['outputs']) != len(self.algorithm.output_map)):
+        if 'outputs' in self.data and (len(self.data['outputs']) != len(self.algorithm.output_map)):
             self.errors.append("The number of outputs of the algorithm doesn't correspond")
 
         for name in self.data['inputs'].keys():
             if name not in self.algorithm.input_map.keys():
                 self.errors.append("The input '%s' doesn't exist in the algorithm" % name)
 
-        if self.data.has_key('outputs'):
+        if 'outputs' in self.data:
             for name in self.data['outputs'].keys():
                 if name not in self.algorithm.output_map.keys():
                     self.errors.append("The output '%s' doesn't exist in the algorithm" % name)
@@ -361,7 +361,8 @@ class BaseExecutor(object):
         data = convert_experiment_configuration_to_container(self.data)
 
         with open(os.path.join(directory, 'configuration.json'), 'wb') as f:
-            simplejson.dump(data, f, indent=2)
+            json_data = simplejson.dumps(data, indent=2)
+            f.write(json_data.encode('utf-8'))
 
         tmp_prefix = os.path.join(directory, 'prefix')
         if not os.path.exists(tmp_prefix):
@@ -374,7 +375,8 @@ class BaseExecutor(object):
         """Exports contents useful for a backend runner to run the algorithm"""
 
         with open(os.path.join(directory, 'configuration.json'), 'wb') as f:
-            simplejson.dump(self.data, f, indent=2)
+            json_data = simplejson.dumps(self.data, indent=2)
+            f.write(json_data.encode('utf-8'))
 
         tmp_prefix = os.path.join(directory, 'prefix')
         if not os.path.exists(tmp_prefix): os.makedirs(tmp_prefix)