[Python-checkins] bpo-39897: Remove needless `Path(self.parent)` call, which makes `is_mount()` misbehave in `Path` subclasses. (GH-18839)

[Barney Gale]

https://github.com/python/cpython/commit/c746c4f353510a17683a49ed7f90ffaae664ff7b
commit: c746c4f353510a17683a49ed7f90ffaae664ff7b
branch: master
author: Barney Gale <barney.gale at gmail.com>
committer: GitHub <noreply at github.com>
date: 2020-04-17T19:42:06+02:00
summary:

bpo-39897: Remove needless `Path(self.parent)` call, which makes `is_mount()` misbehave in `Path` subclasses. (GH-18839)

files:
M Lib/pathlib.py

diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index d2053e6284501..d3e89dfbc88ac 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -1438,9 +1438,8 @@ def is_mount(self):
         if not self.exists() or not self.is_dir():
             return False
 
-        parent = Path(self.parent)
         try:
-            parent_dev = parent.stat().st_dev
+            parent_dev = self.parent.stat().st_dev
         except OSError:
             return False
 
@@ -1448,7 +1447,7 @@ def is_mount(self):
         if dev != parent_dev:
             return True
         ino = self.stat().st_ino
-        parent_ino = parent.stat().st_ino
+        parent_ino = self.parent.stat().st_ino
         return ino == parent_ino
 
     def is_symlink(self):