drop support for python 3.7

.cirrus.yml

@@ -12,7 +12,6 @@ test_task:
     # avoid failures on tests that depend on it.
     SHELL: sh
     matrix:
-      - PYTHON: python3.7
       - PYTHON: python3.8
       - PYTHON: python3.9
       - PYTHON: python3.10

.flake8

@@ -1,5 +1,5 @@
 [flake8]
-min_python_version = 3.7.0
+min_python_version = 3.8.0
 max-line-length = 88
 ban-relative-imports = true
 # flake8-use-fstring: https://github.com/MichaelKim0407/flake8-use-fstring#--percent-greedy-and---format-greedy

.github/workflows/main.yml

@@ -28,7 +28,7 @@ jobs:
     strategy:
       matrix:
         os: [Ubuntu, macOS, Windows]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
         include:
           - os: Ubuntu
             image: ubuntu-22.04

.github/workflows/skip.yml

@@ -28,6 +28,6 @@ jobs:
     strategy:
       matrix:
         os: [Ubuntu, macOS, Windows]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
     steps:
       - run: exit 0

.pre-commit-config.yaml

@@ -49,7 +49,7 @@ repos:
     rev: v3.3.1
     hooks:
       - id: pyupgrade
-        args: [--py37-plus]
+        args: [--py38-plus]
         exclude: ^(install|get)-poetry.py$
 
   - repo: https://github.com/hadialqattan/pycln

docs/_index.md

@@ -18,7 +18,7 @@ Poetry offers a lockfile to ensure repeatable installs, and can build your proje
 
 ## System requirements
 
-Poetry requires **Python 3.7+**. It is multi-platform and the goal is to make it work equally well
+Poetry requires **Python 3.8+**. It is multi-platform and the goal is to make it work equally well
 on Linux, macOS and Windows.
 
 ## Installation

pyproject.toml

@@ -45,11 +45,10 @@ generate-setup-file = false
 
 # Requirements
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.8"
 
 poetry-core = "1.5.2"
 poetry-plugin-export = "^1.3.0"
-"backports.cached-property" = { version = "^1.0.2", python = "<3.8" }
 build = "^0.10.0"
 cachecontrol = { version = "^0.12.9", extras = ["filecache"] }
 cleo = "^2.0.0"
@@ -103,14 +102,12 @@ pytest-cov = "^4.0"
 pytest-mock = "^3.9"
 pytest-randomly = "^3.12"
 pytest-xdist = { version = "^3.1", extras = ["psutil"] }
-zipp = { version = "^3.4", python = "<3.8" }
 
 [tool.poetry.group.typing.dependencies]
 mypy = ">=1.0"
 types-html5lib = ">=1.1.9"
 types-jsonschema = ">=4.9.0"
 types-requests = ">=2.28.8"
-typing-extensions = { version = "^4.0.0", python = "<3.8" }
 
 # only used in github actions
 [tool.poetry.group.github-actions]
@@ -129,7 +126,7 @@ build-backend = "poetry.core.masonry.api"
 
 
 [tool.isort]
-py_version = 37
+py_version = 38
 profile = "black"
 force_single_line = true
 combine_as_imports = true
@@ -141,7 +138,7 @@ known_third_party = ["poetry.core"]
 
 
 [tool.black]
-target-version = ['py37']
+target-version = ['py38']
 preview = true
 force-exclude = '''
 .*/setup\.py$
@@ -161,9 +158,9 @@ enable_error_code = [
     "truthy-bool",
 ]
 
-# use of importlib-metadata backport at python3.7 makes it impossible to
-# satisfy mypy without some ignores: but we get a different set of ignores at
-# different python versions.
+# use of importlib-metadata backport makes it impossible to satisfy mypy
+# without some ignores: but we get a different set of ignores at different
+# python versions.
 #
 # <https://github.com/python/mypy/issues/8823>, meanwhile suppress that
 # warning.

src/poetry/repositories/link_sources/base.py

@@ -3,6 +3,7 @@
 import logging
 import re
 
+from functools import cached_property
 from typing import TYPE_CHECKING
 from typing import DefaultDict
 from typing import List
@@ -11,7 +12,6 @@
 from poetry.core.packages.package import Package
 from poetry.core.version.exceptions import InvalidVersion
 
-from poetry.utils._compat import cached_property
 from poetry.utils.patterns import sdist_file_re
 from poetry.utils.patterns import wheel_file_re
 

src/poetry/repositories/link_sources/html.py

@@ -4,13 +4,13 @@
 import warnings
 
 from collections import defaultdict
+from functools import cached_property
 from html import unescape
 from typing import TYPE_CHECKING
 
 from poetry.core.packages.utils.link import Link
 
 from poetry.repositories.link_sources.base import LinkSource
-from poetry.utils._compat import cached_property
 
 
 if TYPE_CHECKING:

src/poetry/repositories/link_sources/json.py

@@ -1,13 +1,13 @@
 from __future__ import annotations
 
 from collections import defaultdict
+from functools import cached_property
 from typing import TYPE_CHECKING
 from typing import Any
 
 from poetry.core.packages.utils.link import Link
 
 from poetry.repositories.link_sources.base import LinkSource
-from poetry.utils._compat import cached_property
 
 
 if TYPE_CHECKING:

src/poetry/utils/_compat.py

@@ -21,12 +21,6 @@
 else:
     from importlib import metadata
 
-if sys.version_info < (3, 8):
-    # compatibility for python <3.8
-    from backports.cached_property import cached_property
-else:
-    from functools import cached_property
-
 WINDOWS = sys.platform == "win32"
 
 
@@ -62,7 +56,6 @@ def to_str(string: str) -> str:
 
 __all__ = [
     "WINDOWS",
-    "cached_property",
     "decode",
     "encode",
     "metadata",

tests/plugins/test_plugin_manager.py

@@ -2,6 +2,7 @@
 
 from pathlib import Path
 from typing import TYPE_CHECKING
+from typing import Protocol
 
 import pytest
 
@@ -13,7 +14,6 @@
 from poetry.plugins import Plugin
 from poetry.plugins.plugin_manager import PluginManager
 from poetry.poetry import Poetry
-from tests.compat import Protocol
 from tests.helpers import mock_metadata_entry_points
 
 

tests/repositories/test_installed_repository.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import zipfile
+
 from collections import namedtuple
 from pathlib import Path
 from typing import TYPE_CHECKING
@@ -9,7 +11,6 @@
 from poetry.repositories.installed_repository import InstalledRepository
 from poetry.utils._compat import metadata
 from poetry.utils.env import MockEnv as BaseMockEnv
-from tests.compat import zipfile
 
 
 if TYPE_CHECKING: