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

.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

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

@@ -30,11 +30,10 @@ Changelog = "https://python-poetry.org/history/"
 
 # Requirements
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.8"
 
 poetry-core = "1.6.0"
 poetry-plugin-export = "^1.3.1"
-"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"
@@ -77,14 +76,12 @@ 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]
@@ -106,7 +103,7 @@ fix = true
 unfixable = [
     "ERA", # do not autoremove commented out code
 ]
-target-version = "py37"
+target-version = "py38"
 line-length = 88
 extend-select = [
     "B",   # flake8-bugbear
@@ -146,9 +143,8 @@ known-first-party = ["poetry"]
 known-third-party = ["poetry.core"]
 required-imports = ["from __future__ import annotations"]
 
-
 [tool.black]
-target-version = ['py37']
+target-version = ['py38']
 preview = true
 force-exclude = '''
 .*/setup\.py$

src/poetry/installation/executor.py

@@ -766,10 +766,7 @@ def _download_link(self, operation: Install | Update, link: Link) -> Path:
                     link
                 )
                 cached_file = cache_directory.joinpath(link.filename)
-                # We can't use unlink(missing_ok=True) because it's not available
-                # prior to Python 3.8
-                if cached_file.exists():
-                    cached_file.unlink()
+                cached_file.unlink(missing_ok=True)
 
                 raise
 
@@ -897,9 +894,7 @@ def _save_url_reference(self, operation: Operation) -> None:
             ) in self._env.site_packages.find_distribution_direct_url_json_files(
                 distribution_name=package.name, writable_only=True
             ):
-                # We can't use unlink(missing_ok=True) because it's not always available
-                if direct_url_json.exists():
-                    direct_url_json.unlink()
+                direct_url_json.unlink(missing_ok=True)
             return
 
         url_reference: dict[str, Any] | None = None

src/poetry/masonry/builders/editable.py

@@ -132,9 +132,7 @@ def _add_pth(self) -> list[Path]:
                 f"  - Removing existing <c2>{file.name}</c2> from <b>{file.parent}</b>"
                 f" for {self._poetry.file.path.parent}"
             )
-            # We can't use unlink(missing_ok=True) because it's not always available
-            if file.exists():
-                file.unlink()
+            file.unlink(missing_ok=True)
 
         try:
             pth_file = self._env.site_packages.write_text(

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"
 
 
@@ -58,7 +52,6 @@ def encode(string: str, encodings: list[str] | None = None) -> bytes:
 
 __all__ = [
     "WINDOWS",
-    "cached_property",
     "decode",
     "encode",
     "metadata",