deprecate python_marker instead of removing it and only calculate it …

…on demand

src/poetry/core/packages/package.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import re
+import warnings
 
 from typing import TYPE_CHECKING
 from typing import ClassVar
@@ -273,6 +274,21 @@ def python_versions(self, value: str) -> None:
  def python_constraint(self) -> VersionConstraint:
  return self._python_constraint
 
+ @property
+ def python_marker(self) -> BaseMarker:
+ from poetry.core.packages.utils.utils import create_nested_marker
+ from poetry.core.version.markers import parse_marker
+
+ warnings.warn(
+ "`python_marker` is deprecated and will be removed in a future release.",
+ DeprecationWarning,
+ stacklevel=2,
+ )
+
+ return parse_marker(
+ create_nested_marker("python_version", self._python_constraint)
+ )
+
  @property
  def license(self) -> License | None:
  return self._license

tests/packages/test_package.py

@@ -600,6 +600,18 @@ def test_package_pep592_yanked(
  assert package.yanked_reason == expected_yanked_reason
 
 
+def test_python_versions_are_made_precise() -> None:
+ package = Package("foo", "1.2.3")
+ package.python_versions = ">3.6,<=3.10"
+
+ with pytest.warns(DeprecationWarning):
+ assert (
+ str(package.python_marker)
+ == 'python_full_version > "3.6.0" and python_full_version <= "3.10.0"'
+ )
+ assert str(package.python_constraint) == ">3.6,<=3.10"
+
+
 def test_cannot_update_package_version() -> None:
  package = Package("foo", "1.2.3")
  with pytest.raises(AttributeError):