Add DataFrame.items (alias of iteritems) (#787)

databricks/koalas/frame.py

@@ -26,7 +26,7 @@
 from functools import partial, reduce
 import sys
 from itertools import zip_longest
-from typing import Any, Optional, List, Tuple, Union, Generic, TypeVar
+from typing import Any, Optional, List, Tuple, Union, Generic, TypeVar, Iterable
 
 import numpy as np
 import pandas as pd
@@ -916,7 +916,7 @@ def corr(self, method='pearson'):
         """
         return corr(self, method)
 
-    def iteritems(self):
+    def iteritems(self) -> Iterable:
         """
         Iterator over (column name, Series) pairs.
 
@@ -958,6 +958,10 @@ def iteritems(self):
         cols = list(self.columns)
         return list((col_name, self[col_name]) for col_name in cols)
 
+    def items(self) -> Iterable:
+        """This is an alias of ``iteritems``."""
+        return self.iteritems()
+
     def to_clipboard(self, excel=True, sep=None, **kwargs):
         """
         Copy object to the system clipboard.
@@ -5508,13 +5512,13 @@ def astype(self, dtype) -> 'DataFrame':
                 if col_name not in self.columns:
                     raise KeyError('Only a column name can be used for the '
                                    'key in a dtype mappings argument.')
-            for col_name, col in self.iteritems():
+            for col_name, col in self.items():
                 if col_name in dtype:
                     results.append(col.astype(dtype=dtype[col_name]))
                 else:
                     results.append(col)
         else:
-            for col_name, col in self.iteritems():
+            for col_name, col in self.items():
                 results.append(col.astype(dtype=dtype))
         sdf = self._sdf.select(
             self._internal.index_scols + list(map(lambda ser: ser._scol, results)))

databricks/koalas/missing/frame.py

@@ -67,7 +67,6 @@ class _MissingPandasLikeDataFrame(object):
     info = unsupported_function('info')
     insert = unsupported_function('insert')
     interpolate = unsupported_function('interpolate')
-    items = unsupported_function('items')
     iterrows = unsupported_function('iterrows')
     itertuples = unsupported_function('itertuples')
     keys = unsupported_function('keys')

docs/source/reference/frame.rst

@@ -52,6 +52,7 @@ Indexing, iteration
    DataFrame.head
    DataFrame.loc
    DataFrame.iloc
+   DataFrame.items
    DataFrame.iteritems
    DataFrame.get