Bulk-fetching is not implemented

Author: suminb

pandas_datareader/naver.py

@@ -4,6 +4,7 @@
 import numpy as np
 from pandas import DataFrame, to_datetime
 from pandas_datareader.base import _DailyBaseReader
+from six import string_types
 
 
 class NaverDailyReader(_DailyBaseReader):
@@ -22,6 +23,9 @@ def __init__(
         get_actions=False,
         adjust_dividends=True,
     ):
+        if not isinstance(symbols, string_types):
+            raise NotImplementedError("Bulk-fetching is not implemented")
+
         super(NaverDailyReader, self).__init__(
             symbols=symbols,
             start=start,

pandas_datareader/tests/test_naver.py

@@ -21,3 +21,7 @@ def test_naver_daily_reader(self, symbol, start, end):
         assert reader.shape[1] == 6
         assert reader["Date"].min() >= start
         assert reader["Date"].max() <= end
+
+    def test_bulk_fetch(self):
+        with pytest.raises(NotImplementedError):
+            DataReader(["005930", "000660"])