chore: remove unused compatibility code

src/poetry/installation/executor.py

@@ -660,7 +660,7 @@ class Executor:
                 cache_directory = self._chef.get_cache_directory_for_link(link)
                 cached_file = cache_directory.joinpath(link.filename)
                 # We can't use unlink(missing_ok=True) because it's not available
-                # in pathlib2 for Python 2.7
+                # prior to Python 3.8
                 if cached_file.exists():
                     cached_file.unlink()
 

src/poetry/utils/appdirs.py

@@ -240,21 +240,3 @@ if WINDOWS:
         _get_win_folder = _get_win_folder_with_ctypes
     except ImportError:
         _get_win_folder = _get_win_folder_from_registry
-
-
-def _win_path_to_bytes(path: str) -> Union[str, bytes]:
-    """Encode Windows paths to bytes. Only used on Python 2.
-
-    Motivation is to be consistent with other operating systems where paths
-    are also returned as bytes. This avoids problems mixing bytes and Unicode
-    elsewhere in the codebase. For more details and discussion see
-    <https://github.com/pypa/pip/issues/3463>.
-
-    If encoding using ASCII and MBCS fails, return the original Unicode path.
-    """
-    for encoding in ("ASCII", "MBCS"):
-        try:
-            return path.encode(encoding)
-        except (UnicodeEncodeError, LookupError):
-            pass
-    return path

src/poetry/utils/helpers.py

@@ -4,6 +4,7 @@ import shutil
 import stat
 import tempfile
 
+from collections.abc import Mapping
 from contextlib import contextmanager
 from pathlib import Path
 from typing import TYPE_CHECKING
@@ -17,12 +18,6 @@ from typing import Optional
 from poetry.config.config import Config
 
 
-try:
-    from collections.abc import Mapping
-except ImportError:
-    from collections import Mapping
-
-
 if TYPE_CHECKING:
     from requests import Session