Python: Set Python 3.8 as minimal version

.github/workflows/python-ci.yml

@@ -39,7 +39,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: [3.7, 3.8, 3.9]
+        python: ['3.8', '3.9', '3.10']
 
     steps:
     - uses: actions/checkout@v2
@@ -52,4 +52,3 @@ jobs:
         pip install -U tox-gh-actions
     - working-directory: ./python
       run: tox
-

python/.python-version

@@ -1,3 +1,3 @@
-3.7.12
 3.8.12
 3.9.10
+3.10.4

python/setup.cfg

@@ -33,19 +33,17 @@ license_files =
 classifiers =
     License :: OSI Approved :: Apache Software License
     Operating System :: OS Independent
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
 
 [options]
 package_dir =
     = src
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.8
 install_requires =
     mmh3
-    singledispatch
-    cached-property; python_version <= '3.7'
 [options.extras_require]
 arrow =
     pyarrow

python/src/iceberg/expressions/literals.py

@@ -21,25 +21,11 @@
 # pylint: disable=W0613
 
 import struct
-import sys
 from decimal import ROUND_HALF_UP, Decimal
-from functools import singledispatch
+from functools import singledispatch, singledispatchmethod
 from typing import Optional, Union
 from uuid import UUID
 
-from iceberg.utils.datetime import (
-    date_to_days,
-    micros_to_days,
-    time_to_micros,
-    timestamp_to_micros,
-    timestamptz_to_micros,
-)
-
-if sys.version_info >= (3, 8):
-    from functools import singledispatchmethod  # pragma: no cover
-else:
-    from singledispatch import singledispatchmethod  # pragma: no cover
-
 from iceberg.expressions.base import Literal
 from iceberg.types import (
     BinaryType,
@@ -58,6 +44,13 @@
     TimeType,
     UUIDType,
 )
+from iceberg.utils.datetime import (
+    date_to_days,
+    micros_to_days,
+    time_to_micros,
+    timestamp_to_micros,
+    timestamptz_to_micros,
+)
 
 
 @singledispatch

python/src/iceberg/schema.py

@@ -18,18 +18,12 @@
 
 from __future__ import annotations
 
-import sys
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
+from functools import singledispatch
 from typing import Any, Dict, Generic, Iterable, List, Optional, TypeVar
 
 from iceberg.files import StructProtocol
-
-if sys.version_info >= (3, 8):
-    from functools import singledispatch  # pragma: no cover
-else:
-    from singledispatch import singledispatch  # pragma: no cover
-
 from iceberg.types import (
     IcebergType,
     ListType,

python/src/iceberg/types.py

@@ -29,16 +29,10 @@
 Notes:
   - https://iceberg.apache.org/#spec/#primitive-types
 """
-import sys
 from dataclasses import dataclass, field
+from functools import cached_property
 from typing import ClassVar, Dict, List, Optional, Tuple
 
-if sys.version_info >= (3, 8):
-    from functools import cached_property
-else:
-    # In the case of <= Python 3.7
-    from cached_property import cached_property
-
 
 class Singleton:
     _instance = None

python/tox.ini

@@ -16,7 +16,7 @@
 # under the License.
 
 [tox]
-envlist = py37,py38,py39,linters
+envlist = py38,py39,py310,linters
 skip_missing_interpreters = true
 
 [testenv]
@@ -97,9 +97,9 @@ addopts = --doctest-modules
 
 [gh-actions]
 python =
-  3.7: py37
   3.8: py38, linters
   3.9: py39
+  3.10: py310
 
 [mypy]