CLN PEP8 compliance

Author: anhqle

pandas/core/reshape/reshape.py

@@ -127,10 +127,12 @@ def __init__(self, values, index, level=-1, value_columns=None,
         self.removed_level = self.new_index_levels.pop(self.level)
         self.removed_level_full = index.levels[self.level]
 
-        num_rows = np.max([index_level.size for index_level in self.new_index_levels])
+        num_rows = np.max([index_level.size for index_level
+                           in self.new_index_levels])
         num_columns = self.removed_level.size
         if num_rows * num_columns > (2 ** 31 - 1):
-            raise ValueError('Unstacked data frame is too big, causing int32 overflow')
+            raise ValueError('Unstacked DataFrame is too big, '
+                             'causing int32 overflow')
 
         self._make_sorted_values_labels()
         self._make_selectors()

pandas/tests/test_multilevel.py

@@ -1215,7 +1215,8 @@ def test_unstack_unobserved_keys(self):
     @pytest.mark.slow
     def test_unstack_number_of_levels_larger_than_int32(self):
         # GH 20601
-        df = DataFrame(np.random.randn(2 ** 16, 2), index=[np.arange(2 ** 16), np.arange(2 ** 16)])
+        df = DataFrame(np.random.randn(2 ** 16, 2),
+                       index=[np.arange(2 ** 16), np.arange(2 ** 16)])
         with tm.assert_raises_regex(ValueError, 'int32 overflow'):
             df.unstack()