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GH-89812: Churn pathlib.Path methods (GH-104243)

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Re-arrange `pathlib.Path` methods in source code. No other changes.

The methods are arranged as follows:

1. `stat()` and dependants (`exists()`, `is_dir()`, etc)
2. `open()` and dependants (`read_text()`, `write_bytes()`, etc)
3. `iterdir()` and dependants (`glob()`, `walk()`, etc)
4. All other `Path` methods

This patch prepares the ground for a new `_AbstractPath` class, which will
support the methods in groups 1, 2 and 3 above. By churning the methods
here, subsequent patches will be easier to review and less likely to break
things.
This commit is contained in:
Barney Gale 2023-05-07 20:07:07 +01:00 committed by GitHub
parent 2c2dc61e8d
commit e8d77b03e0
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1 changed files with 370 additions and 370 deletions
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740
Lib/pathlib.py
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@ -740,177 +740,6 @@ class Path(PurePath):
"""
__slots__ = ()
def __init__(self, *args, **kwargs):
if kwargs:
msg = ("support for supplying keyword arguments to pathlib.PurePath "
"is deprecated and scheduled for removal in Python {remove}")
warnings._deprecated("pathlib.PurePath(**kwargs)", msg, remove=(3, 14))
super().__init__(*args)
def __new__(cls, *args, **kwargs):
if cls is Path:
cls = WindowsPath if os.name == 'nt' else PosixPath
return object.__new__(cls)
def _make_child_relpath(self, name):
path_str = str(self)
tail = self._tail
if tail:
path_str = f'{path_str}{self._flavour.sep}{name}'
elif path_str != '.':
path_str = f'{path_str}{name}'
else:
path_str = name
path = self.with_segments(path_str)
path._str = path_str
path._drv = self.drive
path._root = self.root
path._tail_cached = tail + [name]
return path
def __enter__(self):
# In previous versions of pathlib, __exit__() marked this path as
# closed; subsequent attempts to perform I/O would raise an IOError.
# This functionality was never documented, and had the effect of
# making Path objects mutable, contrary to PEP 428.
# In Python 3.9 __exit__() was made a no-op.
# In Python 3.11 __enter__() began emitting DeprecationWarning.
# In Python 3.13 __enter__() and __exit__() should be removed.
warnings.warn("pathlib.Path.__enter__() is deprecated and scheduled "
"for removal in Python 3.13; Path objects as a context "
"manager is a no-op",
DeprecationWarning, stacklevel=2)
return self
def __exit__(self, t, v, tb):
pass
# Public API
@classmethod
def cwd(cls):
"""Return a new path pointing to the current working directory."""
# We call 'absolute()' rather than using 'os.getcwd()' directly to
# enable users to replace the implementation of 'absolute()' in a
# subclass and benefit from the new behaviour here. This works because
# os.path.abspath('.') == os.getcwd().
return cls().absolute()
@classmethod
def home(cls):
"""Return a new path pointing to the user's home directory (as
returned by os.path.expanduser('~')).
"""
return cls("~").expanduser()
def samefile(self, other_path):
"""Return whether other_path is the same or not as this file
(as returned by os.path.samefile()).
"""
st = self.stat()
try:
other_st = other_path.stat()
except AttributeError:
other_st = self.with_segments(other_path).stat()
return self._flavour.samestat(st, other_st)
def iterdir(self):
"""Yield path objects of the directory contents.
The children are yielded in arbitrary order, and the
special entries '.' and '..' are not included.
"""
for name in os.listdir(self):
yield self._make_child_relpath(name)
def _scandir(self):
# bpo-24132: a future version of pathlib will support subclassing of
# pathlib.Path to customize how the filesystem is accessed. This
# includes scandir(), which is used to implement glob().
return os.scandir(self)
def glob(self, pattern, *, case_sensitive=None):
"""Iterate over this subtree and yield all existing files (of any
kind, including directories) matching the given relative pattern.
"""
sys.audit("pathlib.Path.glob", self, pattern)
if not pattern:
raise ValueError("Unacceptable pattern: {!r}".format(pattern))
drv, root, pattern_parts = self._parse_path(pattern)
if drv or root:
raise NotImplementedError("Non-relative patterns are unsupported")
if pattern[-1] in (self._flavour.sep, self._flavour.altsep):
pattern_parts.append('')
selector = _make_selector(tuple(pattern_parts), self._flavour, case_sensitive)
for p in selector.select_from(self):
yield p
def rglob(self, pattern, *, case_sensitive=None):
"""Recursively yield all existing files (of any kind, including
directories) matching the given relative pattern, anywhere in
this subtree.
"""
sys.audit("pathlib.Path.rglob", self, pattern)
drv, root, pattern_parts = self._parse_path(pattern)
if drv or root:
raise NotImplementedError("Non-relative patterns are unsupported")
if pattern and pattern[-1] in (self._flavour.sep, self._flavour.altsep):
pattern_parts.append('')
selector = _make_selector(("**",) + tuple(pattern_parts), self._flavour, case_sensitive)
for p in selector.select_from(self):
yield p
def absolute(self):
"""Return an absolute version of this path by prepending the current
working directory. No normalization or symlink resolution is performed.
Use resolve() to get the canonical path to a file.
"""
if self.is_absolute():
return self
elif self.drive:
# There is a CWD on each drive-letter drive.
cwd = self._flavour.abspath(self.drive)
else:
cwd = os.getcwd()
# Fast path for "empty" paths, e.g. Path("."), Path("") or Path().
# We pass only one argument to with_segments() to avoid the cost
# of joining, and we exploit the fact that getcwd() returns a
# fully-normalized string by storing it in _str. This is used to
# implement Path.cwd().
if not self.root and not self._tail:
result = self.with_segments(cwd)
result._str = cwd
return result
return self.with_segments(cwd, self)
def resolve(self, strict=False):
"""
Make the path absolute, resolving all symlinks on the way and also
normalizing it.
"""
def check_eloop(e):
winerror = getattr(e, 'winerror', 0)
if e.errno == ELOOP or winerror == _WINERROR_CANT_RESOLVE_FILENAME:
raise RuntimeError("Symlink loop from %r" % e.filename)
try:
s = self._flavour.realpath(self, strict=strict)
except OSError as e:
check_eloop(e)
raise
p = self.with_segments(s)
# In non-strict mode, realpath() doesn't raise on symlink loops.
# Ensure we get an exception by calling stat()
if not strict:
try:
p.stat()
except OSError as e:
check_eloop(e)
return p
def stat(self, *, follow_symlinks=True):
"""
Return the result of the stat() system call on this path, like
@ -918,149 +747,6 @@ def stat(self, *, follow_symlinks=True):
"""
return os.stat(self, follow_symlinks=follow_symlinks)
def owner(self):
"""
Return the login name of the file owner.
"""
try:
import pwd
return pwd.getpwuid(self.stat().st_uid).pw_name
except ImportError:
raise NotImplementedError("Path.owner() is unsupported on this system")
def group(self):
"""
Return the group name of the file gid.
"""
try:
import grp
return grp.getgrgid(self.stat().st_gid).gr_name
except ImportError:
raise NotImplementedError("Path.group() is unsupported on this system")
def open(self, mode='r', buffering=-1, encoding=None,
errors=None, newline=None):
"""
Open the file pointed by this path and return a file object, as
the built-in open() function does.
"""
if "b" not in mode:
encoding = io.text_encoding(encoding)
return io.open(self, mode, buffering, encoding, errors, newline)
def read_bytes(self):
"""
Open the file in bytes mode, read it, and close the file.
"""
with self.open(mode='rb') as f:
return f.read()
def read_text(self, encoding=None, errors=None):
"""
Open the file in text mode, read it, and close the file.
"""
encoding = io.text_encoding(encoding)
with self.open(mode='r', encoding=encoding, errors=errors) as f:
return f.read()
def write_bytes(self, data):
"""
Open the file in bytes mode, write to it, and close the file.
"""
# type-check for the buffer interface before truncating the file
view = memoryview(data)
with self.open(mode='wb') as f:
return f.write(view)
def write_text(self, data, encoding=None, errors=None, newline=None):
"""
Open the file in text mode, write to it, and close the file.
"""
if not isinstance(data, str):
raise TypeError('data must be str, not %s' %
data.__class__.__name__)
encoding = io.text_encoding(encoding)
with self.open(mode='w', encoding=encoding, errors=errors, newline=newline) as f:
return f.write(data)
def readlink(self):
"""
Return the path to which the symbolic link points.
"""
if not hasattr(os, "readlink"):
raise NotImplementedError("os.readlink() not available on this system")
return self.with_segments(os.readlink(self))
def touch(self, mode=0o666, exist_ok=True):
"""
Create this file with the given access mode, if it doesn't exist.
"""
if exist_ok:
# First try to bump modification time
# Implementation note: GNU touch uses the UTIME_NOW option of
# the utimensat() / futimens() functions.
try:
os.utime(self, None)
except OSError:
# Avoid exception chaining
pass
else:
return
flags = os.O_CREAT | os.O_WRONLY
if not exist_ok:
flags |= os.O_EXCL
fd = os.open(self, flags, mode)
os.close(fd)
def mkdir(self, mode=0o777, parents=False, exist_ok=False):
"""
Create a new directory at this given path.
"""
try:
os.mkdir(self, mode)
except FileNotFoundError:
if not parents or self.parent == self:
raise
self.parent.mkdir(parents=True, exist_ok=True)
self.mkdir(mode, parents=False, exist_ok=exist_ok)
except OSError:
# Cannot rely on checking for EEXIST, since the operating system
# could give priority to other errors like EACCES or EROFS
if not exist_ok or not self.is_dir():
raise
def chmod(self, mode, *, follow_symlinks=True):
"""
Change the permissions of the path, like os.chmod().
"""
os.chmod(self, mode, follow_symlinks=follow_symlinks)
def lchmod(self, mode):
"""
Like chmod(), except if the path points to a symlink, the symlink's
permissions are changed, rather than its target's.
"""
self.chmod(mode, follow_symlinks=False)
def unlink(self, missing_ok=False):
"""
Remove this file or link.
If the path is a directory, use rmdir() instead.
"""
try:
os.unlink(self)
except FileNotFoundError:
if not missing_ok:
raise
def rmdir(self):
"""
Remove this directory. The directory must be empty.
"""
os.rmdir(self)
def lstat(self):
"""
Like stat(), except if the path points to a symlink, the symlink's
@ -1068,51 +754,6 @@ def lstat(self):
"""
return self.stat(follow_symlinks=False)
def rename(self, target):
"""
Rename this path to the target path.
The target path may be absolute or relative. Relative paths are
interpreted relative to the current working directory, *not* the
directory of the Path object.
Returns the new Path instance pointing to the target path.
"""
os.rename(self, target)
return self.with_segments(target)
def replace(self, target):
"""
Rename this path to the target path, overwriting if that path exists.
The target path may be absolute or relative. Relative paths are
interpreted relative to the current working directory, *not* the
directory of the Path object.
Returns the new Path instance pointing to the target path.
"""
os.replace(self, target)
return self.with_segments(target)
def symlink_to(self, target, target_is_directory=False):
"""
Make this path a symlink pointing to the target path.
Note the order of arguments (link, target) is the reverse of os.symlink.
"""
if not hasattr(os, "symlink"):
raise NotImplementedError("os.symlink() not available on this system")
os.symlink(target, self, target_is_directory)
def hardlink_to(self, target):
"""
Make this path a hard link pointing to the same file as *target*.
Note the order of arguments (self, target) is the reverse of os.link's.
"""
if not hasattr(os, "link"):
raise NotImplementedError("os.link() not available on this system")
os.link(target, self)
# Convenience functions for querying the stat results
@ -1258,19 +899,123 @@ def is_socket(self):
# Non-encodable path
return False
def expanduser(self):
""" Return a new path with expanded ~ and ~user constructs
(as returned by os.path.expanduser)
def samefile(self, other_path):
"""Return whether other_path is the same or not as this file
(as returned by os.path.samefile()).
"""
if (not (self.drive or self.root) and
self._tail and self._tail[0][:1] == '~'):
homedir = self._flavour.expanduser(self._tail[0])
if homedir[:1] == "~":
raise RuntimeError("Could not determine home directory.")
drv, root, tail = self._parse_path(homedir)
return self._from_parsed_parts(drv, root, tail + self._tail[1:])
st = self.stat()
try:
other_st = other_path.stat()
except AttributeError:
other_st = self.with_segments(other_path).stat()
return self._flavour.samestat(st, other_st)
return self
def open(self, mode='r', buffering=-1, encoding=None,
errors=None, newline=None):
"""
Open the file pointed by this path and return a file object, as
the built-in open() function does.
"""
if "b" not in mode:
encoding = io.text_encoding(encoding)
return io.open(self, mode, buffering, encoding, errors, newline)
def read_bytes(self):
"""
Open the file in bytes mode, read it, and close the file.
"""
with self.open(mode='rb') as f:
return f.read()
def read_text(self, encoding=None, errors=None):
"""
Open the file in text mode, read it, and close the file.
"""
encoding = io.text_encoding(encoding)
with self.open(mode='r', encoding=encoding, errors=errors) as f:
return f.read()
def write_bytes(self, data):
"""
Open the file in bytes mode, write to it, and close the file.
"""
# type-check for the buffer interface before truncating the file
view = memoryview(data)
with self.open(mode='wb') as f:
return f.write(view)
def write_text(self, data, encoding=None, errors=None, newline=None):
"""
Open the file in text mode, write to it, and close the file.
"""
if not isinstance(data, str):
raise TypeError('data must be str, not %s' %
data.__class__.__name__)
encoding = io.text_encoding(encoding)
with self.open(mode='w', encoding=encoding, errors=errors, newline=newline) as f:
return f.write(data)
def iterdir(self):
"""Yield path objects of the directory contents.
The children are yielded in arbitrary order, and the
special entries '.' and '..' are not included.
"""
for name in os.listdir(self):
yield self._make_child_relpath(name)
def _scandir(self):
# bpo-24132: a future version of pathlib will support subclassing of
# pathlib.Path to customize how the filesystem is accessed. This
# includes scandir(), which is used to implement glob().
return os.scandir(self)
def _make_child_relpath(self, name):
path_str = str(self)
tail = self._tail
if tail:
path_str = f'{path_str}{self._flavour.sep}{name}'
elif path_str != '.':
path_str = f'{path_str}{name}'
else:
path_str = name
path = self.with_segments(path_str)
path._str = path_str
path._drv = self.drive
path._root = self.root
path._tail_cached = tail + [name]
return path
def glob(self, pattern, *, case_sensitive=None):
"""Iterate over this subtree and yield all existing files (of any
kind, including directories) matching the given relative pattern.
"""
sys.audit("pathlib.Path.glob", self, pattern)
if not pattern:
raise ValueError("Unacceptable pattern: {!r}".format(pattern))
drv, root, pattern_parts = self._parse_path(pattern)
if drv or root:
raise NotImplementedError("Non-relative patterns are unsupported")
if pattern[-1] in (self._flavour.sep, self._flavour.altsep):
pattern_parts.append('')
selector = _make_selector(tuple(pattern_parts), self._flavour, case_sensitive)
for p in selector.select_from(self):
yield p
def rglob(self, pattern, *, case_sensitive=None):
"""Recursively yield all existing files (of any kind, including
directories) matching the given relative pattern, anywhere in
this subtree.
"""
sys.audit("pathlib.Path.rglob", self, pattern)
drv, root, pattern_parts = self._parse_path(pattern)
if drv or root:
raise NotImplementedError("Non-relative patterns are unsupported")
if pattern and pattern[-1] in (self._flavour.sep, self._flavour.altsep):
pattern_parts.append('')
selector = _make_selector(("**",) + tuple(pattern_parts), self._flavour, case_sensitive)
for p in selector.select_from(self):
yield p
def walk(self, top_down=True, on_error=None, follow_symlinks=False):
"""Walk the directory tree from this directory, similar to os.walk()."""
@ -1317,6 +1062,261 @@ def walk(self, top_down=True, on_error=None, follow_symlinks=False):
paths += [path._make_child_relpath(d) for d in reversed(dirnames)]
def __init__(self, *args, **kwargs):
if kwargs:
msg = ("support for supplying keyword arguments to pathlib.PurePath "
"is deprecated and scheduled for removal in Python {remove}")
warnings._deprecated("pathlib.PurePath(**kwargs)", msg, remove=(3, 14))
super().__init__(*args)
def __new__(cls, *args, **kwargs):
if cls is Path:
cls = WindowsPath if os.name == 'nt' else PosixPath
return object.__new__(cls)
def __enter__(self):
# In previous versions of pathlib, __exit__() marked this path as
# closed; subsequent attempts to perform I/O would raise an IOError.
# This functionality was never documented, and had the effect of
# making Path objects mutable, contrary to PEP 428.
# In Python 3.9 __exit__() was made a no-op.
# In Python 3.11 __enter__() began emitting DeprecationWarning.
# In Python 3.13 __enter__() and __exit__() should be removed.
warnings.warn("pathlib.Path.__enter__() is deprecated and scheduled "
"for removal in Python 3.13; Path objects as a context "
"manager is a no-op",
DeprecationWarning, stacklevel=2)
return self
def __exit__(self, t, v, tb):
pass
# Public API
@classmethod
def cwd(cls):
"""Return a new path pointing to the current working directory."""
# We call 'absolute()' rather than using 'os.getcwd()' directly to
# enable users to replace the implementation of 'absolute()' in a
# subclass and benefit from the new behaviour here. This works because
# os.path.abspath('.') == os.getcwd().
return cls().absolute()
@classmethod
def home(cls):
"""Return a new path pointing to the user's home directory (as
returned by os.path.expanduser('~')).
"""
return cls("~").expanduser()
def absolute(self):
"""Return an absolute version of this path by prepending the current
working directory. No normalization or symlink resolution is performed.
Use resolve() to get the canonical path to a file.
"""
if self.is_absolute():
return self
elif self.drive:
# There is a CWD on each drive-letter drive.
cwd = self._flavour.abspath(self.drive)
else:
cwd = os.getcwd()
# Fast path for "empty" paths, e.g. Path("."), Path("") or Path().
# We pass only one argument to with_segments() to avoid the cost
# of joining, and we exploit the fact that getcwd() returns a
# fully-normalized string by storing it in _str. This is used to
# implement Path.cwd().
if not self.root and not self._tail:
result = self.with_segments(cwd)
result._str = cwd
return result
return self.with_segments(cwd, self)
def resolve(self, strict=False):
"""
Make the path absolute, resolving all symlinks on the way and also
normalizing it.
"""
def check_eloop(e):
winerror = getattr(e, 'winerror', 0)
if e.errno == ELOOP or winerror == _WINERROR_CANT_RESOLVE_FILENAME:
raise RuntimeError("Symlink loop from %r" % e.filename)
try:
s = self._flavour.realpath(self, strict=strict)
except OSError as e:
check_eloop(e)
raise
p = self.with_segments(s)
# In non-strict mode, realpath() doesn't raise on symlink loops.
# Ensure we get an exception by calling stat()
if not strict:
try:
p.stat()
except OSError as e:
check_eloop(e)
return p
def owner(self):
"""
Return the login name of the file owner.
"""
try:
import pwd
return pwd.getpwuid(self.stat().st_uid).pw_name
except ImportError:
raise NotImplementedError("Path.owner() is unsupported on this system")
def group(self):
"""
Return the group name of the file gid.
"""
try:
import grp
return grp.getgrgid(self.stat().st_gid).gr_name
except ImportError:
raise NotImplementedError("Path.group() is unsupported on this system")
def readlink(self):
"""
Return the path to which the symbolic link points.
"""
if not hasattr(os, "readlink"):
raise NotImplementedError("os.readlink() not available on this system")
return self.with_segments(os.readlink(self))
def touch(self, mode=0o666, exist_ok=True):
"""
Create this file with the given access mode, if it doesn't exist.
"""
if exist_ok:
# First try to bump modification time
# Implementation note: GNU touch uses the UTIME_NOW option of
# the utimensat() / futimens() functions.
try:
os.utime(self, None)
except OSError:
# Avoid exception chaining
pass
else:
return
flags = os.O_CREAT | os.O_WRONLY
if not exist_ok:
flags |= os.O_EXCL
fd = os.open(self, flags, mode)
os.close(fd)
def mkdir(self, mode=0o777, parents=False, exist_ok=False):
"""
Create a new directory at this given path.
"""
try:
os.mkdir(self, mode)
except FileNotFoundError:
if not parents or self.parent == self:
raise
self.parent.mkdir(parents=True, exist_ok=True)
self.mkdir(mode, parents=False, exist_ok=exist_ok)
except OSError:
# Cannot rely on checking for EEXIST, since the operating system
# could give priority to other errors like EACCES or EROFS
if not exist_ok or not self.is_dir():
raise
def chmod(self, mode, *, follow_symlinks=True):
"""
Change the permissions of the path, like os.chmod().
"""
os.chmod(self, mode, follow_symlinks=follow_symlinks)
def lchmod(self, mode):
"""
Like chmod(), except if the path points to a symlink, the symlink's
permissions are changed, rather than its target's.
"""
self.chmod(mode, follow_symlinks=False)
def unlink(self, missing_ok=False):
"""
Remove this file or link.
If the path is a directory, use rmdir() instead.
"""
try:
os.unlink(self)
except FileNotFoundError:
if not missing_ok:
raise
def rmdir(self):
"""
Remove this directory. The directory must be empty.
"""
os.rmdir(self)
def rename(self, target):
"""
Rename this path to the target path.
The target path may be absolute or relative. Relative paths are
interpreted relative to the current working directory, *not* the
directory of the Path object.
Returns the new Path instance pointing to the target path.
"""
os.rename(self, target)
return self.with_segments(target)
def replace(self, target):
"""
Rename this path to the target path, overwriting if that path exists.
The target path may be absolute or relative. Relative paths are
interpreted relative to the current working directory, *not* the
directory of the Path object.
Returns the new Path instance pointing to the target path.
"""
os.replace(self, target)
return self.with_segments(target)
def symlink_to(self, target, target_is_directory=False):
"""
Make this path a symlink pointing to the target path.
Note the order of arguments (link, target) is the reverse of os.symlink.
"""
if not hasattr(os, "symlink"):
raise NotImplementedError("os.symlink() not available on this system")
os.symlink(target, self, target_is_directory)
def hardlink_to(self, target):
"""
Make this path a hard link pointing to the same file as *target*.
Note the order of arguments (self, target) is the reverse of os.link's.
"""
if not hasattr(os, "link"):
raise NotImplementedError("os.link() not available on this system")
os.link(target, self)
def expanduser(self):
""" Return a new path with expanded ~ and ~user constructs
(as returned by os.path.expanduser)
"""
if (not (self.drive or self.root) and
self._tail and self._tail[0][:1] == '~'):
homedir = self._flavour.expanduser(self._tail[0])
if homedir[:1] == "~":
raise RuntimeError("Could not determine home directory.")
drv, root, tail = self._parse_path(homedir)
return self._from_parsed_parts(drv, root, tail + self._tail[1:])
return self
class PosixPath(Path, PurePosixPath):
"""Path subclass for non-Windows systems.