Fixed the issue with the upload_dataset

You cannot create a same method with multiple parameters, therefore I have merged two methods into one. oops !! :)

Author: zardaloop

openml/apiconnector.py

@@ -934,20 +934,14 @@ def _read_url(self, url, add_authentication=False, data=None):
 
         return return_code, string.getvalue()
 
-    def upload_dataset(self, dataset, description):
+    def upload_dataset(self, description, dataset=None):
         try:
-            data = {'dataset': dataset, 'description': description}
-            return_code, dataset_xml = self._perform_api_call("openml.data.upload",data=data)
-
-        except URLError as e:
-            # TODO logger.debug
-            print(e)
-            raise e
-        return return_code, dataset_xml
+            data={}
+            if dataset is None:
+                data = {'description': description}
+            else:
+                data = {'dataset': dataset, 'description': description}
 
-    def upload_dataset(self, description):
-        try:
-            data = {'description': description}
             return_code, dataset_xml = self._perform_api_call("openml.data.upload",data=data)
 
         except URLError as e:

tests/test_apiconnector.py

@@ -269,7 +269,7 @@ def test_upload_dataset(self):
                         <oml:md5_checksum></oml:md5_checksum>
                         </oml:data_set_description>
                          """
-        return_code, dataset_xml = self.connector.upload_dataset(dataset, description)
+        return_code, dataset_xml = self.connector.upload_dataset (description, dataset)
         self.assertEqual(return_code, 200)
 
     def test_upload_dataset_features(self):