add future annotations

Author: MarcoGorelli

.pre-commit-config.yaml

@@ -94,8 +94,6 @@ repos:
         stages: [manual]
         additional_dependencies: &pyright_dependencies
         - [email protected]
--   repo: local
-    hooks:
     -   id: pyright_reportGeneralTypeIssues
         name: pyright reportGeneralTypeIssues
         entry: pyright --skipunannotated -p pyright_reportGeneralTypeIssues.json
@@ -105,8 +103,6 @@ repos:
         types: [python]
         stages: [manual]
         additional_dependencies: *pyright_dependencies
--   repo: local
-    hooks:
     -   id: mypy
         name: mypy
         entry: mypy
@@ -115,8 +111,6 @@ repos:
         pass_filenames: false
         types: [python]
         stages: [manual]
--   repo: local
-    hooks:
     -   id: flake8-rst
         name: flake8-rst
         description: Run flake8 on code snippets in docstrings or RST files
@@ -237,3 +231,15 @@ repos:
         additional_dependencies:
         - flake8==4.0.1
         - flake8-pyi==22.5.1
+    -   id: future-annotations
+        name: import annotations from __future__
+        entry: 'from __future__ import annotations'
+        language: pygrep
+        args: [--negate]
+        files: ^pandas/
+        types: [python]
+        exclude: |
+            (?x)
+            /(__init__\.py)|(api\.py)|(_version\.py)$
+            |/tests/
+            |/_testing/

pandas/_config/dates.py

@@ -1,6 +1,8 @@
 """
 config for datetime formatting
 """
+from __future__ import annotations
+
 from pandas._config import config as cf
 
 pc_date_dayfirst_doc = """

pandas/compat/chainmap.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from typing import (
     ChainMap,
     TypeVar,

pandas/compat/pyarrow.py

@@ -1,5 +1,7 @@
 """ support pyarrow compatibility across versions """
 
+from __future__ import annotations
+
 from pandas.util.version import Version
 
 try:

pandas/conftest.py

@@ -18,6 +18,8 @@
 - Misc
 """
 
+from __future__ import annotations
+
 from collections import abc
 from datetime import (
     date,

pandas/core/_numba/kernels/shared.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import numba
 import numpy as np
 

pandas/core/array_algos/transforms.py

@@ -2,6 +2,8 @@
 transforms.py is for shape-preserving functions.
 """
 
+from __future__ import annotations
+
 import numpy as np
 
 

pandas/core/arraylike.py

@@ -4,6 +4,8 @@
     Index
     ExtensionArray
 """
+from __future__ import annotations
+
 import operator
 from typing import Any
 import warnings

pandas/core/computation/check.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from pandas.compat._optional import import_optional_dependency
 
 ne = import_optional_dependency("numexpr", errors="warn")

pandas/core/computation/common.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from functools import reduce
 
 import numpy as np