Raise on scalars

Author: TomAugspurger

pandas/core/arrays/array_.py

@@ -147,6 +147,12 @@ def array(data,         # type: Sequence[object]
         period_array, ExtensionArray, IntervalArray
     )
 
+    if lib.is_scalar(data):
+        msg = (
+            "Cannot pass scalar '{}' to 'pandas.array'."
+        )
+        raise ValueError(msg.format(data))
+
     if isinstance(data, (ABCSeries, ABCIndexClass)):
         data = data._values
 

pandas/tests/arrays/test_array.py

@@ -169,3 +169,9 @@ def test_array_not_registered(registry_without_decimal):
     result = pd.array(data, dtype=DecimalDtype)
     expected = DecimalArray._from_sequence(data)
     tm.assert_equal(result, expected)
+
+
+def test_scalar_raises():
+    with pytest.raises(ValueError,
+                       match="Cannot pass scalar '1'"):
+        pd.array(1)