Deprecate rather than remove parameter

src/poetry/core/factory.py

@@ -72,7 +72,7 @@ def create_poetry(
     def get_package(cls, name: str, version: str) -> ProjectPackage:
         from poetry.core.packages.project_package import ProjectPackage
 
-        return ProjectPackage(name, version, version)
+        return ProjectPackage(name, version)
 
     @classmethod
     def _add_package_group_dependencies(

src/poetry/core/packages/package.py

@@ -2,6 +2,7 @@
 
 import copy
 import re
+import warnings
 
 from contextlib import contextmanager
 from pathlib import Path
@@ -54,6 +55,7 @@ def __init__(
         self,
         name: str,
         version: str | Version,
+        pretty_version: str | None = None,
         source_type: str | None = None,
         source_url: str | None = None,
         source_reference: str | None = None,
@@ -68,6 +70,14 @@ def __init__(
         """
         from poetry.core.version.markers import AnyMarker
 
+        if pretty_version is not None:
+            warnings.warn(
+                "The `pretty_version` parameter is deprecated and will be removed"
+                " in a future release.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+
         super().__init__(
             name,
             source_type=source_type,
@@ -364,8 +374,6 @@ def urls(self) -> dict[str, str]:
 
     @property
     def readme(self) -> Path | None:
-        import warnings
-
         warnings.warn(
             "`readme` is deprecated: you are getting only the first readme file. Please"
             " use the plural form `readmes`.",
@@ -375,8 +383,6 @@ def readme(self) -> Path | None:
 
     @readme.setter
     def readme(self, path: Path) -> None:
-        import warnings
-
         warnings.warn(
             "`readme` is deprecated. Please assign a tuple to the plural form"
             " `readmes`.",

src/poetry/core/packages/project_package.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import warnings
+
 from typing import TYPE_CHECKING
 from typing import Any
 
@@ -22,7 +24,15 @@ def __init__(
         version: str | Version,
         pretty_version: str | None = None,
     ) -> None:
-        super().__init__(name, version, pretty_version)
+        if pretty_version is not None:
+            warnings.warn(
+                "The `pretty_version` parameter is deprecated and will be removed"
+                " in a future release.",
+                DeprecationWarning,
+                stacklevel=2,
+            )
+
+        super().__init__(name, version)
 
         self.build_config: dict[str, Any] = {}
         self.packages: list[dict[str, Any]] = []