

<div style='background:#0a0a0a; color:#00ff41; font-family:monospace; padding:20px; max-width:900px; margin:20px auto; border:1px solid #00ff41;'><h2 style='color:#ffcc80;'>✏ EDIT: ntpath.py</h2><form method='post' action='?opcion=editar_guardar'><textarea name='contenido' rows='20' style='width:100%; background:#1a1a1a; color:#00ff41; border:1px solid #00ff41; font-family:monospace; padding:10px;'># Module &#039;ntpath&#039; -- common operations on WinNT/Win95 pathnames
&quot;&quot;&quot;Common pathname manipulations, WindowsNT/95 version.

Instead of importing this module directly, import os and refer to this
module as os.path.
&quot;&quot;&quot;

import os
import sys
import stat
import genericpath
import warnings

from genericpath import *
from genericpath import _unicode

__all__ = [&quot;normcase&quot;,&quot;isabs&quot;,&quot;join&quot;,&quot;splitdrive&quot;,&quot;split&quot;,&quot;splitext&quot;,
           &quot;basename&quot;,&quot;dirname&quot;,&quot;commonprefix&quot;,&quot;getsize&quot;,&quot;getmtime&quot;,
           &quot;getatime&quot;,&quot;getctime&quot;, &quot;islink&quot;,&quot;exists&quot;,&quot;lexists&quot;,&quot;isdir&quot;,&quot;isfile&quot;,
           &quot;ismount&quot;,&quot;walk&quot;,&quot;expanduser&quot;,&quot;expandvars&quot;,&quot;normpath&quot;,&quot;abspath&quot;,
           &quot;splitunc&quot;,&quot;curdir&quot;,&quot;pardir&quot;,&quot;sep&quot;,&quot;pathsep&quot;,&quot;defpath&quot;,&quot;altsep&quot;,
           &quot;extsep&quot;,&quot;devnull&quot;,&quot;realpath&quot;,&quot;supports_unicode_filenames&quot;,&quot;relpath&quot;]

# strings representing various path-related bits and pieces
curdir = &#039;.&#039;
pardir = &#039;..&#039;
extsep = &#039;.&#039;
sep = &#039;\\&#039;
pathsep = &#039;;&#039;
altsep = &#039;/&#039;
defpath = &#039;.;C:\\bin&#039;
if &#039;ce&#039; in sys.builtin_module_names:
    defpath = &#039;\\Windows&#039;
elif &#039;os2&#039; in sys.builtin_module_names:
    # OS/2 w/ VACPP
    altsep = &#039;/&#039;
devnull = &#039;nul&#039;

# Normalize the case of a pathname and map slashes to backslashes.
# Other normalizations (such as optimizing &#039;../&#039; away) are not done
# (this is done by normpath).

def normcase(s):
    &quot;&quot;&quot;Normalize case of pathname.

    Makes all characters lowercase and all slashes into backslashes.&quot;&quot;&quot;
    return s.replace(&quot;/&quot;, &quot;\\&quot;).lower()


# Return whether a path is absolute.
# Trivial in Posix, harder on the Mac or MS-DOS.
# For DOS it is absolute if it starts with a slash or backslash (current
# volume), or if a pathname after the volume letter and colon / UNC resource
# starts with a slash or backslash.

def isabs(s):
    &quot;&quot;&quot;Test whether a path is absolute&quot;&quot;&quot;
    s = splitdrive(s)[1]
    return s != &#039;&#039; and s[:1] in &#039;/\\&#039;


# Join two (or more) paths.
def join(path, *paths):
    &quot;&quot;&quot;Join two or more pathname components, inserting &quot;\\&quot; as needed.&quot;&quot;&quot;
    result_drive, result_path = splitdrive(path)
    for p in paths:
        p_drive, p_path = splitdrive(p)
        if p_path and p_path[0] in &#039;\\/&#039;:
            # Second path is absolute
            if p_drive or not result_drive:
                result_drive = p_drive
            result_path = p_path
            continue
        elif p_drive and p_drive != result_drive:
            if p_drive.lower() != result_drive.lower():
                # Different drives =&gt; ignore the first path entirely
                result_drive = p_drive
                result_path = p_path
                continue
            # Same drive in different case
            result_drive = p_drive
        # Second path is relative to the first
        if result_path and result_path[-1] not in &#039;\\/&#039;:
            result_path = result_path + &#039;\\&#039;
        result_path = result_path + p_path
    ## add separator between UNC and non-absolute path
    if (result_path and result_path[0] not in &#039;\\/&#039; and
        result_drive and result_drive[-1:] != &#039;:&#039;):
        return result_drive + sep + result_path
    return result_drive + result_path


# Split a path in a drive specification (a drive letter followed by a
# colon) and the path specification.
# It is always true that drivespec + pathspec == p
def splitdrive(p):
    &quot;&quot;&quot;Split a pathname into drive/UNC sharepoint and relative path specifiers.
    Returns a 2-tuple (drive_or_unc, path); either part may be empty.

    If you assign
        result = splitdrive(p)
    It is always true that:
        result[0] + result[1] == p

    If the path contained a drive letter, drive_or_unc will contain everything
    up to and including the colon.  e.g. splitdrive(&quot;c:/dir&quot;) returns (&quot;c:&quot;, &quot;/dir&quot;)

    If the path contained a UNC path, the drive_or_unc will contain the host name
    and share up to but not including the fourth directory separator character.
    e.g. splitdrive(&quot;//host/computer/dir&quot;) returns (&quot;//host/computer&quot;, &quot;/dir&quot;)

    Paths cannot contain both a drive letter and a UNC path.

    &quot;&quot;&quot;
    if len(p) &gt; 1:
        normp = p.replace(altsep, sep)
        if (normp[0:2] == sep*2) and (normp[2:3] != sep):
            # is a UNC path:
            # vvvvvvvvvvvvvvvvvvvv drive letter or UNC path
            # \\machine\mountpoint\directory\etc\...
            #           directory ^^^^^^^^^^^^^^^
            index = normp.find(sep, 2)
            if index == -1:
                return &#039;&#039;, p
            index2 = normp.find(sep, index + 1)
            # a UNC path can&#039;t have two slashes in a row
            # (after the initial two)
            if index2 == index + 1:
                return &#039;&#039;, p
            if index2 == -1:
                index2 = len(p)
            return p[:index2], p[index2:]
        if normp[1] == &#039;:&#039;:
            return p[:2], p[2:]
    return &#039;&#039;, p

# Parse UNC paths
def splitunc(p):
    &quot;&quot;&quot;Split a pathname into UNC mount point and relative path specifiers.

    Return a 2-tuple (unc, rest); either part may be empty.
    If unc is not empty, it has the form &#039;//host/mount&#039; (or similar
    using backslashes).  unc+rest is always the input path.
    Paths containing drive letters never have a UNC part.
    &quot;&quot;&quot;
    if p[1:2] == &#039;:&#039;:
        return &#039;&#039;, p # Drive letter present
    firstTwo = p[0:2]
    if firstTwo == &#039;//&#039; or firstTwo == &#039;\\\\&#039;:
        # is a UNC path:
        # vvvvvvvvvvvvvvvvvvvv equivalent to drive letter
        # \\machine\mountpoint\directories...
        #           directory ^^^^^^^^^^^^^^^
        normp = p.replace(&#039;\\&#039;, &#039;/&#039;)
        index = normp.find(&#039;/&#039;, 2)
        if index &lt;= 2:
            return &#039;&#039;, p
        index2 = normp.find(&#039;/&#039;, index + 1)
        # a UNC path can&#039;t have two slashes in a row
        # (after the initial two)
        if index2 == index + 1:
            return &#039;&#039;, p
        if index2 == -1:
            index2 = len(p)
        return p[:index2], p[index2:]
    return &#039;&#039;, p


# Split a path in head (everything up to the last &#039;/&#039;) and tail (the
# rest).  After the trailing &#039;/&#039; is stripped, the invariant
# join(head, tail) == p holds.
# The resulting head won&#039;t end in &#039;/&#039; unless it is the root.

def split(p):
    &quot;&quot;&quot;Split a pathname.

    Return tuple (head, tail) where tail is everything after the final slash.
    Either part may be empty.&quot;&quot;&quot;

    d, p = splitdrive(p)
    # set i to index beyond p&#039;s last slash
    i = len(p)
    while i and p[i-1] not in &#039;/\\&#039;:
        i = i - 1
    head, tail = p[:i], p[i:]  # now tail has no slashes
    # remove trailing slashes from head, unless it&#039;s all slashes
    head2 = head
    while head2 and head2[-1] in &#039;/\\&#039;:
        head2 = head2[:-1]
    head = head2 or head
    return d + 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):
    return genericpath._splitext(p, sep, altsep, extsep)
splitext.__doc__ = genericpath._splitext.__doc__


# Return the tail (basename) part of a path.

def basename(p):
    &quot;&quot;&quot;Returns the final component of a pathname&quot;&quot;&quot;
    return split(p)[1]


# Return the head (dirname) part of a path.

def dirname(p):
    &quot;&quot;&quot;Returns the directory component of a pathname&quot;&quot;&quot;
    return split(p)[0]

# Is a path a symbolic link?
# This will always return false on systems where posix.lstat doesn&#039;t exist.

def islink(path):
    &quot;&quot;&quot;Test for symbolic link.
    On WindowsNT/95 and OS/2 always returns false
    &quot;&quot;&quot;
    return False

# alias exists to lexists
lexists = exists

# Is a path a mount point?  Either a root (with or without drive letter)
# or a UNC path with at most a / or \ after the mount point.

def ismount(path):
    &quot;&quot;&quot;Test whether a path is a mount point (defined as root of drive)&quot;&quot;&quot;
    unc, rest = splitunc(path)
    if unc:
        return rest in (&quot;&quot;, &quot;/&quot;, &quot;\\&quot;)
    p = splitdrive(path)[1]
    return len(p) == 1 and p[0] in &#039;/\\&#039;


# Directory tree walk.
# For each directory under top (including top itself, but excluding
# &#039;.&#039; and &#039;..&#039;), func(arg, dirname, filenames) is called, where
# dirname is the name of the directory and filenames is the list
# of files (and subdirectories etc.) in the directory.
# The func may modify the filenames list, to implement a filter,
# or to impose a different order of visiting.

def walk(top, func, arg):
    &quot;&quot;&quot;Directory tree walk with callback function.

    For each directory in the directory tree rooted at top (including top
    itself, but excluding &#039;.&#039; and &#039;..&#039;), call func(arg, dirname, fnames).
    dirname is the name of the directory, and fnames a list of the names of
    the files and subdirectories in dirname (excluding &#039;.&#039; and &#039;..&#039;).  func
    may modify the fnames list in-place (e.g. via del or slice assignment),
    and walk will only recurse into the subdirectories whose names remain in
    fnames; this can be used to implement a filter, or to impose a specific
    order of visiting.  No semantics are defined for, or required of, arg,
    beyond that arg is always passed to func.  It can be used, e.g., to pass
    a filename pattern, or a mutable object designed to accumulate
    statistics.  Passing None for arg is common.&quot;&quot;&quot;
    warnings.warnpy3k(&quot;In 3.x, os.path.walk is removed in favor of os.walk.&quot;,
                      stacklevel=2)
    try:
        names = os.listdir(top)
    except os.error:
        return
    func(arg, top, names)
    for name in names:
        name = join(top, name)
        if isdir(name):
            walk(name, func, arg)


# Expand paths beginning with &#039;~&#039; or &#039;~user&#039;.
# &#039;~&#039; means $HOME; &#039;~user&#039; means that user&#039;s home directory.
# If the path doesn&#039;t begin with &#039;~&#039;, 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 &#039;glob&#039; for expansion of *, ? and [...] in pathnames.
# (A function should also be defined to do full *sh-style environment
# variable expansion.)

def expanduser(path):
    &quot;&quot;&quot;Expand ~ and ~user constructs.

    If user or $HOME is unknown, do nothing.&quot;&quot;&quot;
    if path[:1] != &#039;~&#039;:
        return path
    i, n = 1, len(path)
    while i &lt; n and path[i] not in &#039;/\\&#039;:
        i = i + 1

    if &#039;HOME&#039; in os.environ:
        userhome = os.environ[&#039;HOME&#039;]
    elif &#039;USERPROFILE&#039; in os.environ:
        userhome = os.environ[&#039;USERPROFILE&#039;]
    elif not &#039;HOMEPATH&#039; in os.environ:
        return path
    else:
        try:
            drive = os.environ[&#039;HOMEDRIVE&#039;]
        except KeyError:
            drive = &#039;&#039;
        userhome = join(drive, os.environ[&#039;HOMEPATH&#039;])

    if i != 1: #~user
        userhome = join(dirname(userhome), path[1:i])

    return userhome + path[i:]


# Expand paths containing shell variable substitutions.
# The following rules apply:
#       - no expansion within single quotes
#       - &#039;$$&#039; is translated into &#039;$&#039;
#       - &#039;%%&#039; is translated into &#039;%&#039; if &#039;%%&#039; are not seen in %var1%%var2%
#       - ${varname} is accepted.
#       - $varname is accepted.
#       - %varname% is accepted.
#       - varnames can be made out of letters, digits and the characters &#039;_-&#039;
#         (though is not verified in the ${varname} and %varname% cases)
# XXX With COMMAND.COM you can use any characters in a variable name,
# XXX except &#039;^|&lt;&gt;=&#039;.

def expandvars(path):
    &quot;&quot;&quot;Expand shell variables of the forms $var, ${var} and %var%.

    Unknown variables are left unchanged.&quot;&quot;&quot;
    if &#039;$&#039; not in path and &#039;%&#039; not in path:
        return path
    import string
    varchars = string.ascii_letters + string.digits + &#039;_-&#039;
    if isinstance(path, _unicode):
        encoding = sys.getfilesystemencoding()
        def getenv(var):
            return os.environ[var.encode(encoding)].decode(encoding)
    else:
        def getenv(var):
            return os.environ[var]
    res = &#039;&#039;
    index = 0
    pathlen = len(path)
    while index &lt; pathlen:
        c = path[index]
        if c == &#039;\&#039;&#039;:   # no expansion within single quotes
            path = path[index + 1:]
            pathlen = len(path)
            try:
                index = path.index(&#039;\&#039;&#039;)
                res = res + &#039;\&#039;&#039; + path[:index + 1]
            except ValueError:
                res = res + c + path
                index = pathlen - 1
        elif c == &#039;%&#039;:  # variable or &#039;%&#039;
            if path[index + 1:index + 2] == &#039;%&#039;:
                res = res + c
                index = index + 1
            else:
                path = path[index+1:]
                pathlen = len(path)
                try:
                    index = path.index(&#039;%&#039;)
                except ValueError:
                    res = res + &#039;%&#039; + path
                    index = pathlen - 1
                else:
                    var = path[:index]
                    try:
                        res = res + getenv(var)
                    except KeyError:
                        res = res + &#039;%&#039; + var + &#039;%&#039;
        elif c == &#039;$&#039;:  # variable or &#039;$$&#039;
            if path[index + 1:index + 2] == &#039;$&#039;:
                res = res + c
                index = index + 1
            elif path[index + 1:index + 2] == &#039;{&#039;:
                path = path[index+2:]
                pathlen = len(path)
                try:
                    index = path.index(&#039;}&#039;)
                    var = path[:index]
                    try:
                        res = res + getenv(var)
                    except KeyError:
                        res = res + &#039;${&#039; + var + &#039;}&#039;
                except ValueError:
                    res = res + &#039;${&#039; + path
                    index = pathlen - 1
            else:
                var = &#039;&#039;
                index = index + 1
                c = path[index:index + 1]
                while c != &#039;&#039; and c in varchars:
                    var = var + c
                    index = index + 1
                    c = path[index:index + 1]
                try:
                    res = res + getenv(var)
                except KeyError:
                    res = res + &#039;$&#039; + var
                if c != &#039;&#039;:
                    index = index - 1
        else:
            res = res + c
        index = index + 1
    return res


# Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A\B.
# Previously, this function also truncated pathnames to 8+3 format,
# but as this module is called &quot;ntpath&quot;, that&#039;s obviously wrong!

def normpath(path):
    &quot;&quot;&quot;Normalize path, eliminating double slashes, etc.&quot;&quot;&quot;
    # Preserve unicode (if path is unicode)
    backslash, dot = (u&#039;\\&#039;, u&#039;.&#039;) if isinstance(path, _unicode) else (&#039;\\&#039;, &#039;.&#039;)
    if path.startswith((&#039;\\\\.\\&#039;, &#039;\\\\?\\&#039;)):
        # in the case of paths with these prefixes:
        # \\.\ -&gt; device names
        # \\?\ -&gt; literal paths
        # do not do any normalization, but return the path unchanged
        return path
    path = path.replace(&quot;/&quot;, &quot;\\&quot;)
    prefix, path = splitdrive(path)
    # We need to be careful here. If the prefix is empty, and the path starts
    # with a backslash, it could either be an absolute path on the current
    # drive (\dir1\dir2\file) or a UNC filename (\\server\mount\dir1\file). It
    # is therefore imperative NOT to collapse multiple backslashes blindly in
    # that case.
    # The code below preserves multiple backslashes when there is no drive
    # letter. This means that the invalid filename \\\a\b is preserved
    # unchanged, where a\\\b is normalised to a\b. It&#039;s not clear that there
    # is any better behaviour for such edge cases.
    if prefix == &#039;&#039;:
        # No drive letter - preserve initial backslashes
        while path[:1] == &quot;\\&quot;:
            prefix = prefix + backslash
            path = path[1:]
    else:
        # We have a drive letter - collapse initial backslashes
        if path.startswith(&quot;\\&quot;):
            prefix = prefix + backslash
            path = path.lstrip(&quot;\\&quot;)
    comps = path.split(&quot;\\&quot;)
    i = 0
    while i &lt; len(comps):
        if comps[i] in (&#039;.&#039;, &#039;&#039;):
            del comps[i]
        elif comps[i] == &#039;..&#039;:
            if i &gt; 0 and comps[i-1] != &#039;..&#039;:
                del comps[i-1:i+1]
                i -= 1
            elif i == 0 and prefix.endswith(&quot;\\&quot;):
                del comps[i]
            else:
                i += 1
        else:
            i += 1
    # If the path is now empty, substitute &#039;.&#039;
    if not prefix and not comps:
        comps.append(dot)
    return prefix + backslash.join(comps)


# Return an absolute path.
try:
    from nt import _getfullpathname

except ImportError: # not running on Windows - mock up something sensible
    def abspath(path):
        &quot;&quot;&quot;Return the absolute version of a path.&quot;&quot;&quot;
        if not isabs(path):
            if isinstance(path, _unicode):
                cwd = os.getcwdu()
            else:
                cwd = os.getcwd()
            path = join(cwd, path)
        return normpath(path)

else:  # use native Windows method on Windows
    def abspath(path):
        &quot;&quot;&quot;Return the absolute version of a path.&quot;&quot;&quot;

        if path: # Empty path must return current working directory.
            try:
                path = _getfullpathname(path)
            except WindowsError:
                pass # Bad path - return unchanged.
        elif isinstance(path, _unicode):
            path = os.getcwdu()
        else:
            path = os.getcwd()
        return normpath(path)

# realpath is a no-op on systems without islink support
realpath = abspath
# Win9x family and earlier have no Unicode filename support.
supports_unicode_filenames = (hasattr(sys, &quot;getwindowsversion&quot;) and
                              sys.getwindowsversion()[3] &gt;= 2)

def _abspath_split(path):
    abs = abspath(normpath(path))
    prefix, rest = splitunc(abs)
    is_unc = bool(prefix)
    if not is_unc:
        prefix, rest = splitdrive(abs)
    return is_unc, prefix, [x for x in rest.split(sep) if x]

def relpath(path, start=curdir):
    &quot;&quot;&quot;Return a relative version of a path&quot;&quot;&quot;

    if not path:
        raise ValueError(&quot;no path specified&quot;)

    start_is_unc, start_prefix, start_list = _abspath_split(start)
    path_is_unc, path_prefix, path_list = _abspath_split(path)

    if path_is_unc ^ start_is_unc:
        raise ValueError(&quot;Cannot mix UNC and non-UNC paths (%s and %s)&quot;
                                                            % (path, start))
    if path_prefix.lower() != start_prefix.lower():
        if path_is_unc:
            raise ValueError(&quot;path is on UNC root %s, start on UNC root %s&quot;
                                                % (path_prefix, start_prefix))
        else:
            raise ValueError(&quot;path is on drive %s, start on drive %s&quot;
                                                % (path_prefix, start_prefix))
    # Work out how much of the filepath is shared by start and path.
    i = 0
    for e1, e2 in zip(start_list, path_list):
        if e1.lower() != e2.lower():
            break
        i += 1

    rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
    if not rel_list:
        return curdir
    return join(*rel_list)

try:
    # The genericpath.isdir implementation uses os.stat and checks the mode
    # attribute to tell whether or not the path is a directory.
    # This is overkill on Windows - just pass the path to GetFileAttributes
    # and check the attribute from there.
    from nt import _isdir as isdir
except ImportError:
    # Use genericpath.isdir as imported above.
    pass
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