Apr 5, 2024 · Feb 1, 2024 · Feb 1, 2024 · Feb 1, 2024 · Mar 31, 2024 · Mar 31, 2024
diff --git a/Lib/posixpath.py b/Lib/posixpath.py
    """Return the canonical path of the specified filename, eliminating any
 symbolic links encountered in the path."""
    filename = os.fspath(filename)
    path, ok = _joinrealpath(filename[:0], filename, strict, {})
    return abspath(path)

 # Join two paths, normalizing and eliminating any symbolic links
 # encountered in the second path.
 def _joinrealpath(path, rest, strict, seen):
    if isinstance(path, bytes):
    if isinstance(filename, bytes):
        sep = b'/'
        curdir = b'.'
        pardir = b'..'
        getcwd = os.getcwdb
    else:
        sep = '/'
        curdir = '.'
        pardir = '..'

    if isabs(rest):
        rest = rest[1:]
        path = sep

    while rest:
        name, _, rest = rest.partition(sep)
        getcwd = os.getcwd

    seen = {}
    stack = []
    querying = True
    path = sep if filename.startswith(sep) else getcwd()
    for part in reversed(filename.split(sep)):
        stack.append((False, part))

    while stack:
        is_symlink, name = stack.pop()
        if is_symlink:
            # resolved symlink
            seen[name] = path
            continue
        if not name or name == curdir:
            # current dir
            continue
        if name == pardir:
            # parent dir
            if path:
                path, name = split(path)
                if name == pardir:
                    path = join(path, pardir, pardir)
            newpath, name = split(path)
            if name == pardir:
                path = path + sep + pardir
            else:
                path =pardir
                path =newpath
            continue
        newpath = join(path, name)
        try:
            st = os.lstat(newpath)
        except OSError:
            if strict:
                raise
            is_link = False
        if len(path) == 1:
            newpath = path + name
        else:
 is_link =stat.S_ISLNK(st.st_mode)
        if notis_link:
 newpath =path + sep + name
        if notquerying:
            path = newpath
            continue
        # Resolve the symbolic link
                os.stat(newpath)
            else:
                # Return already resolved part + rest of the path unchanged.
                return join(newpath, rest), False
        seen[newpath] = None # not resolved symlink
        path, ok = _joinrealpath(path, os.readlink(newpath), strict, seen)
        if not ok:
            return join(path, rest), False
        seen[newpath] = path # resolved symlink
                path = newpath
                querying = False
            continue
        try:
            st = os.lstat(newpath)
            if not stat.S_ISLNK(st.st_mode):
                path = newpath
                continue
            target = os.readlink(newpath)
        except OSError:
            if strict:
                raise
            else:
                path = newpath
                querying = False
                continue

    return path, True
        seen[newpath] = None # not resolved symlink
        if target.startswith(sep):
            path = sep
        stack.append((True, newpath))
        for part in reversed(target.split(sep)):
            stack.append((False, part))
    return path


 supports_unicode_filenames = (sys.platform == 'darwin')
diff --git a/Misc/NEWS.d/next/Library/2024-02-01-08-09-20.gh-issue-114847.-JrWrR.rst b/Misc/NEWS.d/next/Library/2024-02-01-08-09-20.gh-issue-114847.-JrWrR.rst
 Speed up :func:`os.path.realpath` on non-Windows platforms.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -432,49 +432,46 @@ def realpath(filename, *, strict=False):
		"""Return the canonical path of the specified filename, eliminating any
		symbolic links encountered in the path."""
		filename = os.fspath(filename)
		path, ok = _joinrealpath(filename[:0], filename, strict, {})
		return abspath(path)

		# Join two paths, normalizing and eliminating any symbolic links
		# encountered in the second path.
		def _joinrealpath(path, rest, strict, seen):
		if isinstance(path, bytes):
		if isinstance(filename, bytes):
		sep = b'/'
		curdir = b'.'
		pardir = b'..'
		getcwd = os.getcwdb
		else:
		sep = '/'
		curdir = '.'
		pardir = '..'

		if isabs(rest):
		rest = rest[1:]
		path = sep

		while rest:
		name, _, rest = rest.partition(sep)
		getcwd = os.getcwd

		seen = {}
		stack = []
		querying = True
		path = sep if filename.startswith(sep) else getcwd()
		for part in reversed(filename.split(sep)):
		stack.append((False, part))

		while stack:
		is_symlink, name = stack.pop()
		if is_symlink:
		# resolved symlink
		seen[name] = path
		continue
		if not name or name == curdir:
		# current dir
		continue
		if name == pardir:
		# parent dir
		if path:
		path, name = split(path)
		if name == pardir:
		path = join(path, pardir, pardir)
		newpath, name = split(path)
		if name == pardir:
		path = path + sep + pardir
		else:
		path =pardir
		path =newpath
		continue
		newpath = join(path, name)
		try:
		st = os.lstat(newpath)
		except OSError:
		if strict:
		raise
		is_link = False
		if len(path) == 1:
		newpath = path + name
		else:
		is_link =stat.S_ISLNK(st.st_mode)
		if notis_link:
		newpath =path + sep + name
		if notquerying:
		path = newpath
		continue
		# Resolve the symbolic link
Expand All		@@ -490,14 +487,30 @@ def _joinrealpath(path, rest, strict, seen):
		os.stat(newpath)
		else:
		# Return already resolved part + rest of the path unchanged.
		return join(newpath, rest), False
		seen[newpath] = None # not resolved symlink
		path, ok = _joinrealpath(path, os.readlink(newpath), strict, seen)
		if not ok:
		return join(path, rest), False
		seen[newpath] = path # resolved symlink
		path = newpath
		querying = False
		continue
		try:
		st = os.lstat(newpath)
		if not stat.S_ISLNK(st.st_mode):
		path = newpath
		continue
		target = os.readlink(newpath)
		except OSError:
		if strict:
		raise
		else:
		path = newpath
		querying = False
		continue

		return path, True
		seen[newpath] = None # not resolved symlink
		if target.startswith(sep):
		path = sep
		stack.append((True, newpath))
		for part in reversed(target.split(sep)):
		stack.append((False, part))
		return path


		supports_unicode_filenames = (sys.platform == 'darwin')
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Speed up :func:`os.path.realpath` on non-Windows platforms.