From 27a2853f69dcfaa67d6b0e5bab7f97135c971cf9 Mon Sep 17 00:00:00 2001
From: MarcoGorelli <>
Date: Wed, 19 Apr 2023 11:17:20 +0100
Subject: [PATCH 1/2] add from_sequence

---
 .../dataframe_api/column_object.py            | 23 ++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/spec/API_specification/dataframe_api/column_object.py b/spec/API_specification/dataframe_api/column_object.py
index 31b610b7..f18279c8 100644
--- a/spec/API_specification/dataframe_api/column_object.py
+++ b/spec/API_specification/dataframe_api/column_object.py
@@ -1,2 +1,23 @@
+from __future__ import annotations
+
+from typing import Sequence
+
+from ._types import dtype
+
 class Column:
-    pass
+    @classmethod
+    def from_sequence(cls, sequence: Sequence[object], dtype: dtype) -> Column:
+        """
+        Construct Column from sequence of elements.
+
+        Parameters
+        ----------
+        sequence : Sequence[object]
+            Sequence of elements.
+        dtype : str
+            Dtype of result. Must be specified.
+        
+        Returns
+        -------
+        Column
+        """

From 1b1b9efd8f1afb1d2533868a3dca2b1fa4dc64ac Mon Sep 17 00:00:00 2001
From: Ralf Gommers <ralf.gommers@gmail.com>
Date: Thu, 27 Apr 2023 11:59:23 +0100
Subject: [PATCH 2/2] Add sentence specifying what dtype elements must have.

---
 spec/API_specification/dataframe_api/column_object.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/spec/API_specification/dataframe_api/column_object.py b/spec/API_specification/dataframe_api/column_object.py
index f18279c8..a08b2349 100644
--- a/spec/API_specification/dataframe_api/column_object.py
+++ b/spec/API_specification/dataframe_api/column_object.py
@@ -13,7 +13,9 @@ def from_sequence(cls, sequence: Sequence[object], dtype: dtype) -> Column:
         Parameters
         ----------
         sequence : Sequence[object]
-            Sequence of elements.
+            Sequence of elements. Each element must be of the specified
+            ``dtype``, the corresponding Python builtin scalar type, or
+            coercible to that Python scalar type.
         dtype : str
             Dtype of result. Must be specified.