Move registration into _abc

Author: barneygale

Lib/pathlib/_abc.py

@@ -14,6 +14,7 @@
 import functools
 from abc import ABC, abstractmethod
 from glob import _PathGlobber, _no_recurse_symlinks
+from pathlib import PurePath, Path
 from pathlib._os import magic_open, CopyReader, CopyWriter
 
 
@@ -206,7 +207,6 @@ def full_match(self, pattern, *, case_sensitive=None):
         return match(str(self)) is not None
 
 
-
 class ReadablePath(JoinablePath):
     """Abstract base class for readable path objects.
 
@@ -446,3 +446,8 @@ def write_text(self, data, encoding=None, errors=None, newline=None):
             return f.write(data)
 
     _copy_writer = property(CopyWriter)
+
+
+JoinablePath.register(PurePath)
+ReadablePath.register(Path)
+WritablePath.register(Path)

Lib/pathlib/_local.py

@@ -20,7 +20,6 @@
     grp = None
 
 from pathlib._os import LocalCopyReader, LocalCopyWriter, PathInfo, DirEntryInfo
-from pathlib._abc import JoinablePath, ReadablePath, WritablePath
 
 
 __all__ = [
@@ -65,7 +64,7 @@ def __repr__(self):
         return "<{}.parents>".format(type(self._path).__name__)
 
 
-class PurePath(JoinablePath):
+class PurePath:
     """Base class for manipulating paths without I/O.
 
     PurePath represents a filesystem path and offers operations which
@@ -587,7 +586,6 @@ def match(self, path_pattern, *, case_sensitive=None):
 # Subclassing abc.ABC makes isinstance() checks slower,
 # which in turn makes path construction slower. Register instead!
 os.PathLike.register(PurePath)
-JoinablePath.register(PurePath)
 
 
 class PurePosixPath(PurePath):
@@ -1233,11 +1231,6 @@ def from_uri(cls, uri):
             raise ValueError(f"URI is not absolute: {uri!r}")
         return path
 
-# Subclassing abc.ABC makes isinstance() checks slower,
-# which in turn makes path construction slower. Register instead!
-ReadablePath.register(Path)
-WritablePath.register(Path)
-
 
 class PosixPath(Path, PurePosixPath):
     """Path subclass for non-Windows systems.