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author	Pablo Galindo <pablogsal@gmail.com>	2020-12-07 19:33:00 (GMT)
committer	Pablo Galindo <pablogsal@gmail.com>	2020-12-07 19:34:10 (GMT)
commit	8bae2a958e8ffb306d00cebdfa1f74247ad81349 (patch)
tree	840a82be9faa9f9efb5d4706c28d979840e1b5bb /Tools/msi/lib/lib_pdb.wixproj
parent	c0afb7fa0ebd1c0e95c0760bbe75a99a8dd12ea6 (diff)
download	cpython-3.10.0a3.zip cpython-3.10.0a3.tar.gz cpython-3.10.0a3.tar.bz2

Python 3.10.0a3v3.10.0a3

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the most performant one was picked. # Added Test for PathLike directory destination, the current fail case ``` Lib/test/test_shutil.py::TestMove::test_move_file_pathlike FAILED [100%] ============================================================== FAILURES =============================================================== __________________________________________________ TestMove.test_move_file_pathlike ___________________________________________________ self = <test.test_shutil.TestMove testMethod=test_move_file_pathlike> def test_move_file_pathlike(self): # Move a file to another location on the same filesystem. src = pathlib.Path(self.src_file) > self._check_move_file(src, self.dst_dir, self.dst_file) Lib/test/test_shutil.py:1563: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Lib/test/test_shutil.py:1545: in _check_move_file shutil.move(src, dst) /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/shutil.py:562: in move real_dst = os.path.join(dst, _basename(src)) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ path = PosixPath('/var/folders/r2/psq74t5x3nbfzlph8bh2pvdw0000gn/T/tmp9ie0wh9_/foo') def _basename(path): # A basename() variant which first strips the trailing slash, if present. # Thus we always get the last component of the path, even for directories. sep = os.path.sep + (os.path.altsep or '') > return os.path.basename(path.rstrip(sep)) E AttributeError: 'PosixPath' object has no attribute 'rstrip' /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/shutil.py:526: AttributeError ============================================== 1 failed, 102 deselected in 0.30 seconds =============================================== ``` After change: ``` ========================================================= test session starts ========================================================= platform darwin -- Python 3.7.4, pytest-5.0.1, py-1.8.0, pluggy-0.12.0 -- /Users/maxwellmckinnon/.venvs/TA3.7/bin/python3.7 cachedir: .pytest_cache rootdir: /Users/maxwellmckinnon/dev/cpython plugins: cov-2.7.1, mock-1.10.4 collected 103 items / 102 deselected / 1 selected Lib/test/test_shutil.py::TestMove::test_move_file_pathlike PASSED [100%] ============================================== 1 passed, 102 deselected in 0.06 seconds =============================================== ``` Running all the tests in test_shutil.py ``` ╰─ pytest Lib/test/test_shutil.py -v ========================================================= test session starts ========================================================= platform darwin -- Python 3.7.4, pytest-5.0.1, py-1.8.0, pluggy-0.12.0 -- /Users/maxwellmckinnon/.venvs/TA3.7/bin/python3.7 cachedir: .pytest_cache rootdir: /Users/maxwellmckinnon/dev/cpython plugins: cov-2.7.1, mock-1.10.4 collected 103 items Lib/test/test_shutil.py::TestShutil::test_chown PASSED [ 0%] Lib/test/test_shutil.py::TestShutil::test_copy PASSED [ 1%] ... Lib/test/test_shutil.py::TermsizeTests::test_stty_match SKIPPED [ 99%] Lib/test/test_shutil.py::PublicAPITests::test_module_all_attribute PASSED [100%] ================================================ 96 passed, 7 skipped in 1.25 seconds ================================================= ``` # Performance Considerations Is it considered poor form to get rid of _basename altogether and make use of pathlib in the move function? I'm not sure if the idea is for all these modules to strictly avoid circular dependencies. They are already using os.path which is just as much a citizen in 3.8 as pathlib right? e.g. `real_dst = os.path.join(dst, _basename(src))` becomes `real_dst = Path(dst) / Path(src).name` I've looked around and familiarized myself, and I now think importing pathlib here is fine. My only remaining concern is that of performance. Here's the performance difference for this step. ``` In [46]: %timeit real_dst = os.path.join("a/b/c", _basename('b/')) 2.71 µs ± 62.6 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each) In [47]: %timeit real_dst = Path("a/b/c") / Path('b/').name 12.4 µs ± 65.3 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each) ``` Is 10us significant or insignificant compared to the least expensive operation this function will do? I don't know. Let's find out. ``` In [55]: %timeit os.rename('/tmp/a/a.txt', '/tmp/a/b.txt'); os.rename('/tmp/a/b.txt', '/tmp/a/a.txt') 124 µs ± 2.18 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each) ``` 62us to rename. 10us seems significant enough that we wouldn't want to favor the Path sugar suggestion. 16% speed decrease from adding the 10us. What do people think? I was hoping to get to use pathlib.Path here, but I suspect for this low level move, it should be as fast as possible, and 16% is not worth one line of sugary code to me. https://bugs.python.org/issue32689 Automerge-Triggered-By: @gvanrossum


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