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Name	Type	Size	Permissions	Modified	Actions
..	Parent	-	drwxr-xr-x	2026-04-10 04:18:08	-
__phello__	Folder	-	0755	2026-04-10 04:18:08
__pycache__	Folder	-	0755	2026-04-10 04:18:08
asyncio	Folder	-	0755	2026-04-10 04:18:08
collections	Folder	-	0755	2026-04-10 04:18:08
concurrent	Folder	-	0755	2026-04-10 04:18:08
ctypes	Folder	-	0755	2026-04-10 04:18:08
curses	Folder	-	0755	2026-04-10 04:18:08
dbm	Folder	-	0755	2026-04-10 04:18:08
email	Folder	-	0755	2026-04-10 04:18:08
encodings	Folder	-	0755	2026-04-10 04:18:08
html	Folder	-	0755	2026-04-10 04:18:08
http	Folder	-	0755	2026-04-10 04:18:08
importlib	Folder	-	0755	2026-04-10 04:18:08
json	Folder	-	0755	2026-04-10 04:18:08
lib-dynload	Folder	-	0755	2026-04-10 04:18:08
logging	Folder	-	0755	2026-04-10 04:18:08
multiprocessing	Folder	-	0755	2026-04-10 04:18:08
pydoc_data	Folder	-	0755	2026-04-10 04:18:08
re	Folder	-	0755	2026-04-10 04:18:08
sqlite3	Folder	-	0755	2026-04-10 04:18:08
test	Folder	-	0755	2026-04-10 04:18:08
tomllib	Folder	-	0755	2026-04-10 04:18:08
unittest	Folder	-	0755	2026-04-10 04:18:08
urllib	Folder	-	0755	2026-04-10 04:18:08
venv	Folder	-	0755	2026-04-10 04:18:08
wsgiref	Folder	-	0755	2026-04-10 04:18:08
xml	Folder	-	0755	2026-04-10 04:18:08
xmlrpc	Folder	-	0755	2026-04-10 04:18:08
zipfile	Folder	-	0755	2026-04-10 04:18:08
zoneinfo	Folder	-	0755	2026-04-10 04:18:08
EXTERNALLY-MANAGED	File	645 B	0644	2026-03-03 12:15:18
LICENSE.txt	File	13.61 KB	0644	2026-03-03 12:15:18
__future__.py	File	5.1 KB	0644	2026-03-03 12:15:18
__hello__.py	File	227 B	0644	2026-03-03 12:15:18
_aix_support.py	File	3.93 KB	0644	2026-03-03 12:15:18
_collections_abc.py	File	31.33 KB	0644	2026-03-03 12:15:18
_compat_pickle.py	File	8.56 KB	0644	2026-03-03 12:15:18
_compression.py	File	5.55 KB	0644	2026-03-03 12:15:18
_distutils_system_mod.py	File	5.58 KB	0644	2026-03-03 12:15:18
_markupbase.py	File	14.31 KB	0644	2026-03-03 12:15:18
_osx_support.py	File	21.51 KB	0644	2026-03-03 12:15:18
_py_abc.py	File	6.04 KB	0644	2026-03-03 12:15:18
_pydatetime.py	File	89.94 KB	0644	2026-03-03 12:15:18
_pydecimal.py	File	223.85 KB	0644	2026-03-03 12:15:18
_pyio.py	File	91.4 KB	0644	2026-03-03 12:15:18
_pylong.py	File	8.83 KB	0644	2026-03-03 12:15:18
_sitebuiltins.py	File	3.05 KB	0644	2026-03-03 12:15:18
_strptime.py	File	24.04 KB	0644	2026-03-03 12:15:18
_sysconfigdata__linux_x86_64-linux-gnu.py	File	48.34 KB	0644	2026-03-03 12:15:18
_sysconfigdata__x86_64-linux-gnu.py	File	48.34 KB	0644	2026-03-03 12:15:18
_threading_local.py	File	7.05 KB	0644	2026-03-03 12:15:18
_weakrefset.py	File	5.75 KB	0644	2026-03-03 12:15:18
abc.py	File	6.38 KB	0644	2026-03-03 12:15:18
aifc.py	File	33.41 KB	0644	2026-03-03 12:15:18
antigravity.py	File	500 B	0644	2026-03-03 12:15:18
argparse.py	File	99.37 KB	0644	2026-03-03 12:15:18
ast.py	File	62.75 KB	0644	2026-03-03 12:15:18
base64.py	File	20.12 KB	0755	2026-03-03 12:15:18
bdb.py	File	31.7 KB	0644	2026-03-03 12:15:18
bisect.py	File	3.34 KB	0644	2026-03-03 12:15:18
bz2.py	File	11.57 KB	0644	2026-03-03 12:15:18
cProfile.py	File	6.4 KB	0755	2026-03-03 12:15:18
calendar.py	File	24.82 KB	0644	2026-03-03 12:15:18
cgi.py	File	33.61 KB	0755	2026-03-03 12:15:18
cgitb.py	File	12.13 KB	0644	2026-03-03 12:15:18
chunk.py	File	5.37 KB	0644	2026-03-03 12:15:18
cmd.py	File	14.52 KB	0644	2026-03-03 12:15:18
code.py	File	10.44 KB	0644	2026-03-03 12:15:18
codecs.py	File	36.01 KB	0644	2026-03-03 12:15:18
codeop.py	File	5.77 KB	0644	2026-03-03 12:15:18
colorsys.py	File	3.97 KB	0644	2026-03-03 12:15:18
compileall.py	File	20.12 KB	0644	2026-03-03 12:15:18
configparser.py	File	52.53 KB	0644	2026-03-03 12:15:18
contextlib.py	File	26.99 KB	0644	2026-03-03 12:15:18
contextvars.py	File	129 B	0644	2026-03-03 12:15:18
copy.py	File	8.21 KB	0644	2026-03-03 12:15:18
copyreg.py	File	7.44 KB	0644	2026-03-03 12:15:18
crypt.py	File	3.82 KB	0644	2026-03-03 12:15:18
csv.py	File	16 KB	0644	2026-03-03 12:15:18
dataclasses.py	File	60.31 KB	0644	2026-03-03 12:15:18
datetime.py	File	268 B	0644	2026-03-03 12:15:18
decimal.py	File	320 B	0644	2026-03-03 12:15:18
difflib.py	File	81.36 KB	0644	2026-03-03 12:15:18
dis.py	File	29.5 KB	0644	2026-03-03 12:15:18
doctest.py	File	103.98 KB	0644	2026-03-03 12:15:18
enum.py	File	79.72 KB	0644	2026-03-03 12:15:18
filecmp.py	File	9.95 KB	0644	2026-03-03 12:15:18
fileinput.py	File	15.35 KB	0644	2026-03-03 12:15:18
fnmatch.py	File	5.86 KB	0644	2026-03-03 12:15:18
fractions.py	File	37.17 KB	0644	2026-03-03 12:15:18
ftplib.py	File	33.92 KB	0644	2026-03-03 12:15:18
functools.py	File	37.23 KB	0644	2026-03-03 12:15:18
genericpath.py	File	5.44 KB	0644	2026-03-03 12:15:18
getopt.py	File	7.31 KB	0644	2026-03-03 12:15:18
getpass.py	File	5.85 KB	0644	2026-03-03 12:15:18
gettext.py	File	21.24 KB	0644	2026-03-03 12:15:18
glob.py	File	8.53 KB	0644	2026-03-03 12:15:18
graphlib.py	File	9.43 KB	0644	2026-03-03 12:15:18
gzip.py	File	24.28 KB	0644	2026-03-03 12:15:18
hashlib.py	File	9.13 KB	0644	2026-03-03 12:15:18
heapq.py	File	22.48 KB	0644	2026-03-03 12:15:18
hmac.py	File	7.54 KB	0644	2026-03-03 12:15:18
imaplib.py	File	52.43 KB	0644	2026-03-03 12:15:18
imghdr.py	File	4.29 KB	0644	2026-03-03 12:15:18
inspect.py	File	122.48 KB	0644	2026-03-03 12:15:18
io.py	File	3.5 KB	0644	2026-03-03 12:15:18
ipaddress.py	File	76.46 KB	0644	2026-03-03 12:15:18
keyword.py	File	1.05 KB	0644	2026-03-03 12:15:18
linecache.py	File	5.52 KB	0644	2026-03-03 12:15:18
locale.py	File	76.72 KB	0644	2026-03-03 12:15:18
lzma.py	File	12.97 KB	0644	2026-03-03 12:15:18
mailbox.py	File	77.06 KB	0644	2026-03-03 12:15:18
mailcap.py	File	9.11 KB	0644	2026-03-03 12:15:18
mimetypes.py	File	22.35 KB	0644	2026-03-03 12:15:18
modulefinder.py	File	23.14 KB	0644	2026-03-03 12:15:18
netrc.py	File	6.76 KB	0644	2026-03-03 12:15:18
nntplib.py	File	40.12 KB	0644	2026-03-03 12:15:18
ntpath.py	File	29.32 KB	0644	2026-03-03 12:15:18
nturl2path.py	File	2.82 KB	0644	2026-03-03 12:15:18
numbers.py	File	11.2 KB	0644	2026-03-03 12:15:18
opcode.py	File	12.87 KB	0644	2026-03-03 12:15:18
operator.py	File	10.71 KB	0644	2026-03-03 12:15:18
optparse.py	File	58.95 KB	0644	2026-03-03 12:15:18
os.py	File	38.85 KB	0644	2026-03-03 12:15:18
pathlib.py	File	49.95 KB	0644	2026-03-03 12:15:18
pdb.py	File	67.83 KB	0755	2026-03-03 12:15:18
pickle.py	File	63.38 KB	0644	2026-03-03 12:15:18
pickletools.py	File	91.66 KB	0644	2026-03-03 12:15:18
pipes.py	File	8.77 KB	0644	2026-03-03 12:15:18
pkgutil.py	File	17.85 KB	0644	2026-03-03 12:15:18
platform.py	File	42.32 KB	0755	2026-03-03 12:15:18
plistlib.py	File	27.91 KB	0644	2026-03-03 12:15:18
poplib.py	File	13.83 KB	0644	2026-03-03 12:15:18
posixpath.py	File	17.21 KB	0644	2026-03-03 12:15:18
pprint.py	File	23.59 KB	0644	2026-03-03 12:15:18
profile.py	File	22.55 KB	0755	2026-03-03 12:15:18
pstats.py	File	28.6 KB	0644	2026-03-03 12:15:18
pty.py	File	5.99 KB	0644	2026-03-03 12:15:18
py_compile.py	File	7.69 KB	0644	2026-03-03 12:15:18
pyclbr.py	File	11.13 KB	0644	2026-03-03 12:15:18
pydoc.py	File	110.44 KB	0755	2026-03-03 12:15:18
queue.py	File	11.23 KB	0644	2026-03-03 12:15:18
quopri.py	File	7.01 KB	0755	2026-03-03 12:15:18
random.py	File	33.87 KB	0644	2026-03-03 12:15:18
reprlib.py	File	6.42 KB	0644	2026-03-03 12:15:18
rlcompleter.py	File	7.64 KB	0644	2026-03-03 12:15:18
runpy.py	File	12.6 KB	0644	2026-03-03 12:15:18
sched.py	File	6.2 KB	0644	2026-03-03 12:15:18
secrets.py	File	1.94 KB	0644	2026-03-03 12:15:18
selectors.py	File	19.21 KB	0644	2026-03-03 12:15:18
shelve.py	File	8.36 KB	0644	2026-03-03 12:15:18
shlex.py	File	13.04 KB	0644	2026-03-03 12:15:18
shutil.py	File	56.76 KB	0644	2026-03-03 12:15:18
signal.py	File	2.44 KB	0644	2026-03-03 12:15:18
site.py	File	23.34 KB	0644	2026-03-03 12:15:18
sitecustomize.py	File	0 B	0	1970-01-01 00:00:00
smtplib.py	File	42.51 KB	0755	2026-03-03 12:15:18
sndhdr.py	File	7.27 KB	0644	2026-03-03 12:15:18
socket.py	File	36.53 KB	0644	2026-03-03 12:15:18
socketserver.py	File	27.2 KB	0644	2026-03-03 12:15:18
sre_compile.py	File	231 B	0644	2026-03-03 12:15:18
sre_constants.py	File	232 B	0644	2026-03-03 12:15:18
sre_parse.py	File	229 B	0644	2026-03-03 12:15:18
ssl.py	File	49.63 KB	0644	2026-03-03 12:15:18
stat.py	File	5.36 KB	0644	2026-03-03 12:15:18
statistics.py	File	49.05 KB	0644	2026-03-03 12:15:18
string.py	File	11.51 KB	0644	2026-03-03 12:15:18
stringprep.py	File	12.61 KB	0644	2026-03-03 12:15:18
struct.py	File	257 B	0644	2026-03-03 12:15:18
subprocess.py	File	86.65 KB	0644	2026-03-03 12:15:18
sunau.py	File	18.04 KB	0644	2026-03-03 12:15:18
symtable.py	File	10.5 KB	0644	2026-03-03 12:15:18
sysconfig.py	File	32 KB	0644	2026-03-03 12:15:18
tabnanny.py	File	11.26 KB	0755	2026-03-03 12:15:18
tarfile.py	File	109.92 KB	0755	2026-03-03 12:15:18
telnetlib.py	File	22.75 KB	0644	2026-03-03 12:15:18
tempfile.py	File	36.46 KB	0644	2026-03-03 12:15:18
textwrap.py	File	19.26 KB	0644	2026-03-03 12:15:18
this.py	File	1003 B	0644	2026-03-03 12:15:18
threading.py	File	58.71 KB	0644	2026-03-03 12:15:18
timeit.py	File	13.15 KB	0755	2026-03-03 12:15:18
token.py	File	2.42 KB	0644	2026-03-03 12:15:18
tokenize.py	File	20.72 KB	0644	2026-03-03 12:15:18
trace.py	File	28.5 KB	0755	2026-03-03 12:15:18
traceback.py	File	45.24 KB	0644	2026-03-03 12:15:18
tracemalloc.py	File	17.62 KB	0644	2026-03-03 12:15:18
tty.py	File	1.99 KB	0644	2026-03-03 12:15:18
turtle.py	File	142.93 KB	0644	2026-03-03 12:15:18
types.py	File	10.74 KB	0644	2026-03-03 12:15:18
typing.py	File	114.68 KB	0644	2026-03-03 12:15:18
uu.py	File	7.19 KB	0755	2026-03-03 12:15:18
uuid.py	File	28.96 KB	0644	2026-03-03 12:15:18
warnings.py	File	21.25 KB	0644	2026-03-03 12:15:18
wave.py	File	22.24 KB	0644	2026-03-03 12:15:18
weakref.py	File	21.01 KB	0644	2026-03-03 12:15:18
webbrowser.py	File	23.07 KB	0755	2026-03-03 12:15:18
xdrlib.py	File	5.8 KB	0644	2026-03-03 12:15:18
zipapp.py	File	7.37 KB	0644	2026-03-03 12:15:18
zipimport.py	File	27.47 KB	0644	2026-03-03 12:15:18

"""Common operations on Posix pathnames.

Instead of importing this module directly, import os and refer to
this module as os.path.  The "os.path" name is an alias for this
module on Posix systems; on other systems (e.g. Windows),
os.path provides the same operations in a manner specific to that
platform, and is an alias to another module (e.g. ntpath).

Some of this can actually be useful on non-Posix systems too, e.g.
for manipulation of the pathname component of URLs.
"""

# Strings representing various path-related bits and pieces.
# These are primarily for export; internally, they are hardcoded.
# Should be set before imports for resolving cyclic dependency.
curdir = '.'
pardir = '..'
extsep = '.'
sep = '/'
pathsep = ':'
defpath = '/bin:/usr/bin'
altsep = None
devnull = '/dev/null'

import os
import sys
import stat
import genericpath
from genericpath import *

__all__ = ["normcase","isabs","join","splitdrive","splitroot","split","splitext",
           "basename","dirname","commonprefix","getsize","getmtime",
           "getatime","getctime","islink","exists","lexists","isdir","isfile",
           "ismount", "expanduser","expandvars","normpath","abspath",
           "samefile","sameopenfile","samestat",
           "curdir","pardir","sep","pathsep","defpath","altsep","extsep",
           "devnull","realpath","supports_unicode_filenames","relpath",
           "commonpath", "isjunction", "ALLOW_MISSING"]

def _get_sep(path):
    if isinstance(path, bytes):
        return b'/'
    else:
        return '/'

# Normalize the case of a pathname.  Trivial in Posix, string.lower on Mac.
# On MS-DOS this may also turn slashes into backslashes; however, other
# normalizations (such as optimizing '../' away) are not allowed
# (another function should be defined to do that).

def normcase(s):
    """Normalize case of pathname.  Has no effect under Posix"""
    return os.fspath(s)

# Return whether a path is absolute.
# Trivial in Posix, harder on the Mac or MS-DOS.

def isabs(s):
    """Test whether a path is absolute"""
    s = os.fspath(s)
    sep = _get_sep(s)
    return s.startswith(sep)

# Join pathnames.
# Ignore the previous parts if a part is absolute.
# Insert a '/' unless the first part is empty or already ends in '/'.

def join(a, *p):
    """Join two or more pathname components, inserting '/' as needed.
    If any component is an absolute path, all previous path components
    will be discarded.  An empty last part will result in a path that
    ends with a separator."""
    a = os.fspath(a)
    sep = _get_sep(a)
    path = a
    try:
        if not p:
            path[:0] + sep  #23780: Ensure compatible data type even if p is null.
        for b in map(os.fspath, p):
            if b.startswith(sep):
                path = b
            elif not path or path.endswith(sep):
                path += b
            else:
                path += sep + b
    except (TypeError, AttributeError, BytesWarning):
        genericpath._check_arg_types('join', a, *p)
        raise
    return path

# Split a path in head (everything up to the last '/') and tail (the
# rest).  If the path ends in '/', tail will be empty.  If there is no
# '/' in the path, head  will be empty.
# Trailing '/'es are stripped from head unless it is the root.

def split(p):
    """Split a pathname.  Returns tuple "(head, tail)" where "tail" is
    everything after the final slash.  Either part may be empty."""
    p = os.fspath(p)
    sep = _get_sep(p)
    i = p.rfind(sep) + 1
    head, tail = p[:i], p[i:]
    if head and head != sep*len(head):
        head = head.rstrip(sep)
    return head, tail

# Split a path in root and extension.
# The extension is everything starting at the last dot in the last
# pathname component; the root is everything before that.
# It is always true that root + ext == p.

def splitext(p):
    p = os.fspath(p)
    if isinstance(p, bytes):
        sep = b'/'
        extsep = b'.'
    else:
        sep = '/'
        extsep = '.'
    return genericpath._splitext(p, sep, None, extsep)
splitext.__doc__ = genericpath._splitext.__doc__

# Split a pathname into a drive specification and the rest of the
# path.  Useful on DOS/Windows/NT; on Unix, the drive is always empty.

def splitdrive(p):
    """Split a pathname into drive and path. On Posix, drive is always
    empty."""
    p = os.fspath(p)
    return p[:0], p

def splitroot(p):
    """Split a pathname into drive, root and tail. On Posix, drive is always
    empty; the root may be empty, a single slash, or two slashes. The tail
    contains anything after the root. For example:

splitroot('foo/bar') == ('', '', 'foo/bar')
        splitroot('/foo/bar') == ('', '/', 'foo/bar')
        splitroot('//foo/bar') == ('', '//', 'foo/bar')
        splitroot('///foo/bar') == ('', '/', '//foo/bar')
    """
    p = os.fspath(p)
    if isinstance(p, bytes):
        sep = b'/'
        empty = b''
    else:
        sep = '/'
        empty = ''
    if p[:1] != sep:
        # Relative path, e.g.: 'foo'
        return empty, empty, p
    elif p[1:2] != sep or p[2:3] == sep:
        # Absolute path, e.g.: '/foo', '///foo', '////foo', etc.
        return empty, sep, p[1:]
    else:
        # Precisely two leading slashes, e.g.: '//foo'. Implementation defined per POSIX, see
        # https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13
        return empty, p[:2], p[2:]

# Return the tail (basename) part of a path, same as split(path)[1].

def basename(p):
    """Returns the final component of a pathname"""
    p = os.fspath(p)
    sep = _get_sep(p)
    i = p.rfind(sep) + 1
    return p[i:]

# Return the head (dirname) part of a path, same as split(path)[0].

def dirname(p):
    """Returns the directory component of a pathname"""
    p = os.fspath(p)
    sep = _get_sep(p)
    i = p.rfind(sep) + 1
    head = p[:i]
    if head and head != sep*len(head):
        head = head.rstrip(sep)
    return head

# Is a path a junction?

def isjunction(path):
    """Test whether a path is a junction
    Junctions are not a part of posix semantics"""
    os.fspath(path)
    return False

# Being true for dangling symbolic links is also useful.

def lexists(path):
    """Test whether a path exists.  Returns True for broken symbolic links"""
    try:
        os.lstat(path)
    except (OSError, ValueError):
        return False
    return True

# Is a path a mount point?
# (Does this work for all UNIXes?  Is it even guaranteed to work by Posix?)

def ismount(path):
    """Test whether a path is a mount point"""
    try:
        s1 = os.lstat(path)
    except (OSError, ValueError):
        # It doesn't exist -- so not a mount point. :-)
        return False
    else:
        # A symlink can never be a mount point
        if stat.S_ISLNK(s1.st_mode):
            return False

path = os.fspath(path)
    if isinstance(path, bytes):
        parent = join(path, b'..')
    else:
        parent = join(path, '..')
    parent = realpath(parent)
    try:
        s2 = os.lstat(parent)
    except (OSError, ValueError):
        return False

dev1 = s1.st_dev
    dev2 = s2.st_dev
    if dev1 != dev2:
        return True     # path/.. on a different device as path
    ino1 = s1.st_ino
    ino2 = s2.st_ino
    if ino1 == ino2:
        return True     # path/.. is the same i-node as path
    return False

# Expand paths beginning with '~' or '~user'.
# '~' means $HOME; '~user' means that user's home directory.
# If the path doesn't begin with '~', or if the user or $HOME is unknown,
# the path is returned unchanged (leaving error reporting to whatever
# function is called with the expanded path as argument).
# See also module 'glob' for expansion of *, ? and [...] in pathnames.
# (A function should also be defined to do full *sh-style environment
# variable expansion.)

def expanduser(path):
    """Expand ~ and ~user constructions.  If user or $HOME is unknown,
    do nothing."""
    path = os.fspath(path)
    if isinstance(path, bytes):
        tilde = b'~'
    else:
        tilde = '~'
    if not path.startswith(tilde):
        return path
    sep = _get_sep(path)
    i = path.find(sep, 1)
    if i < 0:
        i = len(path)
    if i == 1:
        if 'HOME' not in os.environ:
            try:
                import pwd
            except ImportError:
                # pwd module unavailable, return path unchanged
                return path
            try:
                userhome = pwd.getpwuid(os.getuid()).pw_dir
            except KeyError:
                # bpo-10496: if the current user identifier doesn't exist in the
                # password database, return the path unchanged
                return path
        else:
            userhome = os.environ['HOME']
    else:
        try:
            import pwd
        except ImportError:
            # pwd module unavailable, return path unchanged
            return path
        name = path[1:i]
        if isinstance(name, bytes):
            name = str(name, 'ASCII')
        try:
            pwent = pwd.getpwnam(name)
        except KeyError:
            # bpo-10496: if the user name from the path doesn't exist in the
            # password database, return the path unchanged
            return path
        userhome = pwent.pw_dir
    # if no user home, return the path unchanged on VxWorks
    if userhome is None and sys.platform == "vxworks":
        return path
    if isinstance(path, bytes):
        userhome = os.fsencode(userhome)
        root = b'/'
    else:
        root = '/'
    userhome = userhome.rstrip(root)
    return (userhome + path[i:]) or root

# Expand paths containing shell variable substitutions.
# This expands the forms $variable and ${variable} only.
# Non-existent variables are left unchanged.

_varpattern = r'\$(\w+|\{[^}]*\}?)'
_varsub = None
_varsubb = None

def expandvars(path):
    """Expand shell variables of form $var and ${var}.  Unknown variables
    are left unchanged."""
    path = os.fspath(path)
    global _varsub, _varsubb
    if isinstance(path, bytes):
        if b'$' not in path:
            return path
        if not _varsubb:
            import re
            _varsubb = re.compile(_varpattern.encode(), re.ASCII).sub
        sub = _varsubb
        start = b'{'
        end = b'}'
        environ = getattr(os, 'environb', None)
    else:
        if '$' not in path:
            return path
        if not _varsub:
            import re
            _varsub = re.compile(_varpattern, re.ASCII).sub
        sub = _varsub
        start = '{'
        end = '}'
        environ = os.environ

def repl(m):
        name = m[1]
        if name.startswith(start):
            if not name.endswith(end):
                return m[0]
            name = name[1:-1]
        try:
            if environ is None:
                value = os.fsencode(os.environ[os.fsdecode(name)])
            else:
                value = environ[name]
        except KeyError:
            return m[0]
        else:
            return value

return sub(repl, path)

# Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B.
# It should be understood that this may change the meaning of the path
# if it contains symbolic links!

try:
    from posix import _path_normpath

except ImportError:
    def normpath(path):
        """Normalize path, eliminating double slashes, etc."""
        path = os.fspath(path)
        if isinstance(path, bytes):
            sep = b'/'
            empty = b''
            dot = b'.'
            dotdot = b'..'
        else:
            sep = '/'
            empty = ''
            dot = '.'
            dotdot = '..'
        if path == empty:
            return dot
        _, initial_slashes, path = splitroot(path)
        comps = path.split(sep)
        new_comps = []
        for comp in comps:
            if comp in (empty, dot):
                continue
            if (comp != dotdot or (not initial_slashes and not new_comps) or
                 (new_comps and new_comps[-1] == dotdot)):
                new_comps.append(comp)
            elif new_comps:
                new_comps.pop()
        comps = new_comps
        path = initial_slashes + sep.join(comps)
        return path or dot

else:
    def normpath(path):
        """Normalize path, eliminating double slashes, etc."""
        path = os.fspath(path)
        if isinstance(path, bytes):
            return os.fsencode(_path_normpath(os.fsdecode(path))) or b"."
        return _path_normpath(path) or "."

def abspath(path):
    """Return an absolute path."""
    path = os.fspath(path)
    if not isabs(path):
        if isinstance(path, bytes):
            cwd = os.getcwdb()
        else:
            cwd = os.getcwd()
        path = join(cwd, path)
    return normpath(path)

# Return a canonical path (i.e. the absolute location of a file on the
# filesystem).

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):
        sep = b'/'
        curdir = b'.'
        pardir = b'..'
    else:
        sep = '/'
        curdir = '.'
        pardir = '..'
        getcwd = os.getcwd
    if strict is ALLOW_MISSING:
        ignored_error = FileNotFoundError
    elif strict:
        ignored_error = ()
    else:
        ignored_error = OSError

maxlinks = None

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

while rest:
        name, _, rest = rest.partition(sep)
        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)
            else:
                path = pardir
            continue
        newpath = join(path, name)
        try:
            st = os.lstat(newpath)
        except ignored_error:
            is_link = False
        else:
            is_link = stat.S_ISLNK(st.st_mode)
        if not is_link:
            path = newpath
            continue
        # Resolve the symbolic link
        if newpath in seen:
            # Already seen this path
            path = seen[newpath]
            if path is not None:
                # use cached value
                continue
            # The symlink is not resolved, so we must have a symlink loop.
            if strict:
                # Raise OSError(errno.ELOOP)
                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

return path, True

supports_unicode_filenames = (sys.platform == 'darwin')

def relpath(path, start=None):
    """Return a relative version of a path"""

if not path:
        raise ValueError("no path specified")

path = os.fspath(path)
    if isinstance(path, bytes):
        curdir = b'.'
        sep = b'/'
        pardir = b'..'
    else:
        curdir = '.'
        sep = '/'
        pardir = '..'

if start is None:
        start = curdir
    else:
        start = os.fspath(start)

try:
        start_list = [x for x in abspath(start).split(sep) if x]
        path_list = [x for x in abspath(path).split(sep) if x]
        # Work out how much of the filepath is shared by start and path.
        i = len(commonprefix([start_list, path_list]))

rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
        if not rel_list:
            return curdir
        return join(*rel_list)
    except (TypeError, AttributeError, BytesWarning, DeprecationWarning):
        genericpath._check_arg_types('relpath', path, start)
        raise

# Return the longest common sub-path of the sequence of paths given as input.
# The paths are not normalized before comparing them (this is the
# responsibility of the caller). Any trailing separator is stripped from the
# returned path.

def commonpath(paths):
    """Given a sequence of path names, returns the longest common sub-path."""

if not paths:
        raise ValueError('commonpath() arg is an empty sequence')

paths = tuple(map(os.fspath, paths))
    if isinstance(paths[0], bytes):
        sep = b'/'
        curdir = b'.'
    else:
        sep = '/'
        curdir = '.'

try:
        split_paths = [path.split(sep) for path in paths]

try:
            isabs, = set(p[:1] == sep for p in paths)
        except ValueError:
            raise ValueError("Can't mix absolute and relative paths") from None

split_paths = [[c for c in s if c and c != curdir] for s in split_paths]
        s1 = min(split_paths)
        s2 = max(split_paths)
        common = s1
        for i, c in enumerate(s1):
            if c != s2[i]:
                common = s1[:i]
                break

prefix = sep if isabs else sep[:0]
        return prefix + sep.join(common)
    except (TypeError, AttributeError):
        genericpath._check_arg_types('commonpath', *paths)
        raise

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