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Edit File : posixpath.py \| Size : 13.96 KB
"""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. Mac, Windows), os.path provides the same operations in a manner specific to that platform, and is an alias to another module (e.g. macpath, ntpath). Some of this can actually be useful on non-Posix systems too, e.g. for manipulation of the pathname component of URLs. """ import os import sys import stat import genericpath import warnings from genericpath import * from genericpath import _unicode __all__ = ["normcase","isabs","join","splitdrive","split","splitext", "basename","dirname","commonprefix","getsize","getmtime", "getatime","getctime","islink","exists","lexists","isdir","isfile", "ismount","walk","expanduser","expandvars","normpath","abspath", "samefile","sameopenfile","samestat", "curdir","pardir","sep","pathsep","defpath","altsep","extsep", "devnull","realpath","supports_unicode_filenames","relpath"] # strings representing various path-related bits and pieces curdir = '.' pardir = '..' extsep = '.' sep = '/' pathsep = ':' defpath = ':/bin:/usr/bin' altsep = None devnull = '/dev/null' # 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 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""" return s.startswith('/') # 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.""" path = a for b in p: if b.startswith('/'): path = b elif path == '' or path.endswith('/'): path += b else: path += '/' + b 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.""" i = p.rfind('/') + 1 head, tail = p[:i], p[i:] if head and head != '/'len(head): head = head.rstrip('/') 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): return genericpath._splitext(p, sep, altsep, 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.""" return '', p # Return the tail (basename) part of a path, same as split(path)[1]. def basename(p): """Returns the final component of a pathname""" i = p.rfind('/') + 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""" i = p.rfind('/') + 1 head = p[:i] if head and head != '/'len(head): head = head.rstrip('/') return head # Is a path a symbolic link? # This will always return false on systems where os.lstat doesn't exist. def islink(path): """Test whether a path is a symbolic link""" try: st = os.lstat(path) except (os.error, AttributeError): return False return stat.S_ISLNK(st.st_mode) # 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 os.error: return False return True # Are two filenames really pointing to the same file? def samefile(f1, f2): """Test whether two pathnames reference the same actual file""" s1 = os.stat(f1) s2 = os.stat(f2) return samestat(s1, s2) # Are two open files really referencing the same file? # (Not necessarily the same file descriptor!) def sameopenfile(fp1, fp2): """Test whether two open file objects reference the same file""" s1 = os.fstat(fp1) s2 = os.fstat(fp2) return samestat(s1, s2) # Are two stat buffers (obtained from stat, fstat or lstat) # describing the same file? def samestat(s1, s2): """Test whether two stat buffers reference the same file""" return s1.st_ino == s2.st_ino and \ s1.st_dev == s2.st_dev # 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""" if islink(path): # A symlink can never be a mount point return False try: s1 = os.lstat(path) s2 = os.lstat(realpath(join(path, '..'))) except os.error: return False # It doesn't exist -- so not a mount point :-) 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 # Directory tree walk. # For each directory under top (including top itself, but excluding # '.' and '..'), 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): """Directory tree walk with callback function. For each directory in the directory tree rooted at top (including top itself, but excluding '.' and '..'), 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 '.' and '..'). 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.""" warnings.warnpy3k("In 3.x, os.path.walk is removed in favor of os.walk.", stacklevel=2) try: names = os.listdir(top) except os.error: return func(arg, top, names) for name in names: name = join(top, name) try: st = os.lstat(name) except os.error: continue if stat.S_ISDIR(st.st_mode): walk(name, func, arg) # 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.""" if not path.startswith('~'): return path i = path.find('/', 1) if i < 0: i = len(path) if i == 1: if 'HOME' not in os.environ: import pwd 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: import pwd try: pwent = pwd.getpwnam(path[1:i]) 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 userhome = userhome.rstrip('/') return (userhome + path[i:]) or '/' # Expand paths containing shell variable substitutions. # This expands the forms $variable and ${variable} only. # Non-existent variables are left unchanged. _varprog = None _uvarprog = None def expandvars(path): """Expand shell variables of form $var and ${var}. Unknown variables are left unchanged.""" global _varprog, _uvarprog if '$' not in path: return path if isinstance(path, _unicode): if not _uvarprog: import re _uvarprog = re.compile(ur'\$(\w+\|\{[^}]\})', re.UNICODE) varprog = _uvarprog encoding = sys.getfilesystemencoding() else: if not _varprog: import re _varprog = re.compile(r'\$(\w+\|\{[^}]\})') varprog = _varprog encoding = None i = 0 while True: m = varprog.search(path, i) if not m: break i, j = m.span(0) name = m.group(1) if name.startswith('{') and name.endswith('}'): name = name[1:-1] if encoding: name = name.encode(encoding) if name in os.environ: tail = path[j:] value = os.environ[name] if encoding: value = value.decode(encoding) path = path[:i] + value i = len(path) path += tail else: i = j return 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! def normpath(path): """Normalize path, eliminating double slashes, etc.""" # Preserve unicode (if path is unicode) slash, dot = (u'/', u'.') if isinstance(path, _unicode) else ('/', '.') if path == '': return dot initial_slashes = path.startswith('/') # POSIX allows one or two initial slashes, but treats three or more # as single slash. if (initial_slashes and path.startswith('//') and not path.startswith('///')): initial_slashes = 2 comps = path.split('/') new_comps = [] for comp in comps: if comp in ('', '.'): continue if (comp != '..' or (not initial_slashes and not new_comps) or (new_comps and new_comps[-1] == '..')): new_comps.append(comp) elif new_comps: new_comps.pop() comps = new_comps path = slash.join(comps) if initial_slashes: path = slashinitial_slashes + path return path or dot def abspath(path): """Return an absolute path.""" if not isabs(path): if isinstance(path, _unicode): cwd = os.getcwdu() 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): """Return the canonical path of the specified filename, eliminating any symbolic links encountered in the path.""" path, ok = _joinrealpath('', filename, {}) return abspath(path) # Join two paths, normalizing and eliminating any symbolic links # encountered in the second path. def _joinrealpath(path, rest, seen): 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) if not islink(newpath): 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. # 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), 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=curdir): """Return a relative version of a path""" if not path: raise ValueError("no path specified") 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) Back

Edit File : posixpath.py | Size : 13.96 KB

"""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. Mac, Windows),
os.path provides the same operations in a manner specific to that
platform, and is an alias to another module (e.g. macpath, ntpath).

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

import os
import sys
import stat
import genericpath
import warnings
from genericpath import *
from genericpath import _unicode

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

# strings representing various path-related bits and pieces
curdir = '.'
pardir = '..'
extsep = '.'
sep = '/'
pathsep = ':'
defpath = ':/bin:/usr/bin'
altsep = None
devnull = '/dev/null'

# 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 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"""
    return s.startswith('/')

# 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."""
    path = a
    for b in p:
        if b.startswith('/'):
            path = b
        elif path == '' or path.endswith('/'):
            path +=  b
        else:
            path += '/' + b
    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."""
    i = p.rfind('/') + 1
    head, tail = p[:i], p[i:]
    if head and head != '/'*len(head):
        head = head.rstrip('/')
    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):
    return genericpath._splitext(p, sep, altsep, 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."""
    return '', p

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

def basename(p):
    """Returns the final component of a pathname"""
    i = p.rfind('/') + 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"""
    i = p.rfind('/') + 1
    head = p[:i]
    if head and head != '/'*len(head):
        head = head.rstrip('/')
    return head

# Is a path a symbolic link?
# This will always return false on systems where os.lstat doesn't exist.

def islink(path):
    """Test whether a path is a symbolic link"""
    try:
        st = os.lstat(path)
    except (os.error, AttributeError):
        return False
    return stat.S_ISLNK(st.st_mode)

# 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 os.error:
        return False
    return True

# Are two filenames really pointing to the same file?

def samefile(f1, f2):
    """Test whether two pathnames reference the same actual file"""
    s1 = os.stat(f1)
    s2 = os.stat(f2)
    return samestat(s1, s2)

# Are two open files really referencing the same file?
# (Not necessarily the same file descriptor!)

def sameopenfile(fp1, fp2):
    """Test whether two open file objects reference the same file"""
    s1 = os.fstat(fp1)
    s2 = os.fstat(fp2)
    return samestat(s1, s2)

# Are two stat buffers (obtained from stat, fstat or lstat)
# describing the same file?

def samestat(s1, s2):
    """Test whether two stat buffers reference the same file"""
    return s1.st_ino == s2.st_ino and \
           s1.st_dev == s2.st_dev

# 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"""
    if islink(path):
        # A symlink can never be a mount point
        return False
    try:
        s1 = os.lstat(path)
        s2 = os.lstat(realpath(join(path, '..')))
    except os.error:
        return False # It doesn't exist -- so not a mount point :-)
    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

# Directory tree walk.
# For each directory under top (including top itself, but excluding
# '.' and '..'), 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):
    """Directory tree walk with callback function.

For each directory in the directory tree rooted at top (including top
    itself, but excluding '.' and '..'), 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 '.' and '..').  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."""
    warnings.warnpy3k("In 3.x, os.path.walk is removed in favor of os.walk.",
                      stacklevel=2)
    try:
        names = os.listdir(top)
    except os.error:
        return
    func(arg, top, names)
    for name in names:
        name = join(top, name)
        try:
            st = os.lstat(name)
        except os.error:
            continue
        if stat.S_ISDIR(st.st_mode):
            walk(name, func, arg)

# 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."""
    if not path.startswith('~'):
        return path
    i = path.find('/', 1)
    if i < 0:
        i = len(path)
    if i == 1:
        if 'HOME' not in os.environ:
            import pwd
            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:
        import pwd
        try:
            pwent = pwd.getpwnam(path[1:i])
        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
    userhome = userhome.rstrip('/')
    return (userhome + path[i:]) or '/'

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

_varprog = None
_uvarprog = None

def expandvars(path):
    """Expand shell variables of form $var and ${var}.  Unknown variables
    are left unchanged."""
    global _varprog, _uvarprog
    if '$' not in path:
        return path
    if isinstance(path, _unicode):
        if not _uvarprog:
            import re
            _uvarprog = re.compile(ur'\$(\w+|\{[^}]*\})', re.UNICODE)
        varprog = _uvarprog
        encoding = sys.getfilesystemencoding()
    else:
        if not _varprog:
            import re
            _varprog = re.compile(r'\$(\w+|\{[^}]*\})')
        varprog = _varprog
        encoding = None
    i = 0
    while True:
        m = varprog.search(path, i)
        if not m:
            break
        i, j = m.span(0)
        name = m.group(1)
        if name.startswith('{') and name.endswith('}'):
            name = name[1:-1]
        if encoding:
            name = name.encode(encoding)
        if name in os.environ:
            tail = path[j:]
            value = os.environ[name]
            if encoding:
                value = value.decode(encoding)
            path = path[:i] + value
            i = len(path)
            path += tail
        else:
            i = j
    return 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!

def normpath(path):
    """Normalize path, eliminating double slashes, etc."""
    # Preserve unicode (if path is unicode)
    slash, dot = (u'/', u'.') if isinstance(path, _unicode) else ('/', '.')
    if path == '':
        return dot
    initial_slashes = path.startswith('/')
    # POSIX allows one or two initial slashes, but treats three or more
    # as single slash.
    if (initial_slashes and
        path.startswith('//') and not path.startswith('///')):
        initial_slashes = 2
    comps = path.split('/')
    new_comps = []
    for comp in comps:
        if comp in ('', '.'):
            continue
        if (comp != '..' or (not initial_slashes and not new_comps) or
             (new_comps and new_comps[-1] == '..')):
            new_comps.append(comp)
        elif new_comps:
            new_comps.pop()
    comps = new_comps
    path = slash.join(comps)
    if initial_slashes:
        path = slash*initial_slashes + path
    return path or dot

def abspath(path):
    """Return an absolute path."""
    if not isabs(path):
        if isinstance(path, _unicode):
            cwd = os.getcwdu()
        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):
    """Return the canonical path of the specified filename, eliminating any
symbolic links encountered in the path."""
    path, ok = _joinrealpath('', filename, {})
    return abspath(path)

# Join two paths, normalizing and eliminating any symbolic links
# encountered in the second path.
def _joinrealpath(path, rest, seen):
    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)
        if not islink(newpath):
            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.
            # 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), 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=curdir):
    """Return a relative version of a path"""

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

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)

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