bpo-46148: Optimize pathlib

Lib/pathlib.py

@@ -9,7 +9,6 @@
 import warnings
 from _collections_abc import Sequence
 from errno import ENOENT, ENOTDIR, EBADF, ELOOP
-from operator import attrgetter
 from stat import S_ISDIR, S_ISLNK, S_ISREG, S_ISSOCK, S_ISBLK, S_ISCHR, S_ISFIFO
 from urllib.parse import quote_from_bytes as urlquote_from_bytes
 
@@ -364,7 +363,7 @@ def group(self, path):
 #
 # Globbing helpers
 #
-
+@functools.lru_cache
 def _make_selector(pattern_parts, flavour):
     pat = pattern_parts[0]
     child_parts = pattern_parts[1:]
@@ -378,9 +377,6 @@ def _make_selector(pattern_parts, flavour):
         cls = _PreciseSelector
     return cls(pat, child_parts, flavour)
 
-if hasattr(functools, "lru_cache"):
-    _make_selector = functools.lru_cache()(_make_selector)
-
 
 class _Selector:
     """A selector matches a specific glob pattern part against the children
@@ -565,6 +561,7 @@ def __reduce__(self):
         return (self.__class__, tuple(self._parts))
 
     @classmethod
+    @functools.cache
     def _parse_args(cls, args):
         # This is useful when you don't want to create an instance, just
         # canonicalize some constructor arguments.
@@ -693,11 +690,15 @@ def __ge__(self, other):
     def __class_getitem__(cls, type):
         return cls
 
-    drive = property(attrgetter('_drv'),
-                     doc="""The drive prefix (letter or UNC path), if any.""")
+    @property
+    def drive(self):
+        """The drive prefix (letter or UNC path), if any."""
+        return self._drv
 
-    root = property(attrgetter('_root'),
-                    doc="""The root of the path, if any.""")
+    @property
+    def root(self):
+        """The root of the path, if any."""
+        return self._root
 
     @property
     def anchor(self):
@@ -856,7 +857,7 @@ def __truediv__(self, key):
 
     def __rtruediv__(self, key):
         try:
-            return self._from_parts([key] + self._parts)
+            return self._from_parts((key, *self._parts))
         except TypeError:
             return NotImplemented
 
@@ -1057,7 +1058,7 @@ def absolute(self):
             return self
         # FIXME this must defer to the specific flavour (and, under Windows,
         # use nt._getfullpathname())
-        return self._from_parts([self._accessor.getcwd()] + self._parts)
+        return self._from_parts((self._accessor.getcwd(), *self._parts))
 
     def resolve(self, strict=False):
         """
@@ -1436,7 +1437,7 @@ def expanduser(self):
             homedir = self._accessor.expanduser(self._parts[0])
             if homedir[:1] == "~":
                 raise RuntimeError("Could not determine home directory.")
-            return self._from_parts([homedir] + self._parts[1:])
+            return self._from_parts((homedir, *self._parts[1:]))
 
         return self
 

Misc/NEWS.d/next/Library/2022-01-05-11-36-28.bpo-46148.FCtoon.rst

@@ -0,0 +1 @@
+Speedup :class:`~pathlib.Path` creation up to ``3x``. Patch by Kumar Aditya.