Deprecate Python 3.6

.flake8

@@ -1,4 +1,5 @@
 [flake8]
+min_python_version = 3.7.0
 max-line-length = 88
 ignore = E501, E203, W503, ANN101, ANN102, SIM106
 ban-relative-imports = True

.github/workflows/integration.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: [Ubuntu, MacOS, Windows]
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
         experimental: [false]
         include:
           - os: Ubuntu

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [Ubuntu, MacOS, Windows]
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: [3.7, 3.8, 3.9]
         experimental: [false]
         bootstrap-args: [""]
         include:

.pre-commit-config.yaml

@@ -51,7 +51,7 @@ repos:
     hooks:
       - id: pyupgrade
         args:
-          - --py36-plus
+          - --py37-plus
 
   - repo: https://github.com/pycqa/isort
     rev: 5.10.1

pyproject.toml

@@ -33,23 +33,22 @@ exclude = [
 "Bug Tracker" = "https://github.com/python-poetry/poetry/issues"
 
 [tool.poetry.dependencies]
-python = "^3.6"
+python = "^3.7"
 
 # required for compatibility
 importlib-metadata = {version = ">=1.7.0", python = "<3.8"}
-dataclasses = {version = ">=0.8", python = "~3.6"}
 
 [tool.poetry.dev-dependencies]
-pre-commit = {version = "^2.15.0", python = "^3.6.1"}
+pre-commit = "^2.15.0"
 pyrsistent = "^0.18.0"
 pytest = "^6.2"
 pytest-cov = "^2.8"
 pytest-mock = "^3.5"
 tox = "^3.0"
 vendoring = {version = "^0.3", python = "^3.8"}
 pep517 = "^0.11.0"
-black = {version = "^21.9b0", markers = "python_version >= '3.6.2' and python_version < '4.0' and implementation_name != 'pypy'"}
-isort = {version = "^5.9.3", python = "^3.6.1"}
+black = {version = "^21.9b0", markers = "python_version >= '3.7.0' and python_version < '4.0' and implementation_name != 'pypy'"}
+isort = "^5.9.3"
 
 [tool.black]
 line-length = 88

src/poetry/core/utils/_compat.py

@@ -3,18 +3,9 @@
 from typing import List
 
 
-PY36 = sys.version_info >= (3, 6)
-PY37 = sys.version_info >= (3, 7)
-
 WINDOWS = sys.platform == "win32"
 
 
-try:
-    FileNotFoundError
-except NameError:
-    FileNotFoundError = IOError
-
-
 def list_to_shell_command(cmd: List[str]) -> str:
     executable = cmd[0]
 

tests/masonry/builders/test_builder.py

@@ -10,7 +10,6 @@
 
 from poetry.core.factory import Factory
 from poetry.core.masonry.builders.builder import Builder
-from poetry.core.utils._compat import PY37
 
 
 if TYPE_CHECKING:
@@ -29,7 +28,7 @@ def test_builder_find_excluded_files(mocker: "MockerFixture"):
 
 
 @pytest.mark.xfail(
-    sys.platform == "win32" and not PY37,
+    sys.platform == "win32",
     reason="Windows is case insensitive for the most part",
 )
 def test_builder_find_case_sensitive_excluded_files(mocker: "MockerFixture"):
@@ -54,7 +53,7 @@ def test_builder_find_case_sensitive_excluded_files(mocker: "MockerFixture"):
 
 
 @pytest.mark.xfail(
-    sys.platform == "win32" and not PY37,
+    sys.platform == "win32",
     reason="Windows is case insensitive for the most part",
 )
 def test_builder_find_invalid_case_sensitive_excluded_files(mocker: "MockerFixture"):

tests/testutils.py

@@ -7,13 +7,12 @@
 from contextlib import contextmanager
 from pathlib import Path
 from typing import Any
-from typing import ContextManager
 from typing import Dict
+from typing import Generator
 from typing import List
 from typing import Optional
 
 from poetry.core.toml import TOMLFile
-from poetry.core.utils._compat import PY37
 
 
 __toml_build_backend_patch__ = {
@@ -27,7 +26,7 @@
 @contextmanager
 def temporary_project_directory(
     path: Path, toml_patch: Optional[Dict[str, Any]] = None
-) -> ContextManager[str]:
+) -> Generator[str, None, None]:
     """
     Context manager that takes a project source directory, copies content to a temporary
     directory, patches the `pyproject.toml` using the provided patch, or using the default
@@ -56,10 +55,7 @@ def subprocess_run(*args: str, **kwargs: Any) -> subprocess.CompletedProcess:
     """
     Helper method to run a subprocess. Asserts for success.
     """
-    compat_kwargs = {"text" if PY37 else "universal_newlines": True}
-    result = subprocess.run(
-        args, **compat_kwargs, stdout=subprocess.PIPE, stderr=subprocess.PIPE, **kwargs
-    )
+    result = subprocess.run(args, text=True, capture_output=True, **kwargs)
     assert result.returncode == 0
     return result
 

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 minversion = 3.3.0
 isolated_build = True
-envlist = py36, py37, py38, py39, pypy3, integration
+envlist = py37, py38, py39, pypy3, integration
 
 [testenv]
 whitelist_externals = poetry

vendors/pyproject.toml

@@ -19,7 +19,7 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.6"
+python = "^3.7"
 
 jsonschema = "^3.2.0"
 lark-parser = "^0.9.0"