"shutil" --- Opérations de haut niveau sur les fichiers
*******************************************************

**Code source :** Lib/shutil.py

======================================================================

Le module "shutil" propose des opérations de haut niveau sur les
fichiers et ensembles de fichiers. En particulier, des fonctions pour
copier et déplacer les fichiers sont proposées. Pour les opérations
individuelles sur les fichiers, reportez-vous au module "os".

Avertissement:

  Même les fonctions de copie haut niveau ("shutil.copy()",
  "shutil.copy2()") ne peuvent copier toutes les métadonnées des
  fichiers.Sur les plateformes POSIX, cela signifie que le
  propriétaire et le groupe du fichier sont perdus, ainsi que les
  *ACLs*. Sur Mac OS, le clonage de ressource et autres métadonnées ne
  sont pas utilisés. Cela signifie que les ressources seront perdues
  et que le type de fichier et les codes créateur ne seront pas
  corrects. Sur Windows, les propriétaires des fichiers, *ACLs* et
  flux de données alternatifs ne sont pas copiés.


Opérations sur les répertoires et les fichiers
==============================================

shutil.copyfileobj(fsrc, fdst[, length])

   Copie le contenu de l'objet fichier *fsrc* dans l'objet fichier
   *fdst*. L'entier *length*, si spécifié, est la taille du tampon. En
   particulier, une valeur de *length* négative signifie la copie des
   données sans découper la source en morceaux ; par défaut les
   données sont lues par morceaux pour éviter la consommation mémoire
   non-contrôlée. À noter que si la position courante dans l'objet
   *fsrc* n'est pas 0, seul le contenu depuis la position courante
   jusqu'à la fin est copié.

shutil.copyfile(src, dst, *, follow_symlinks=True)

   Copy the contents (no metadata) of the file named *src* to a file
   named *dst* and return *dst* in the most efficient way possible.
   *src* and *dst* are path-like objects or path names given as
   strings.

   *dst* must be the complete target file name; look at "copy()" for a
   copy that accepts a target directory path.  If *src* and *dst*
   specify the same file, "SameFileError" is raised.

   La cible doit être accessible en écriture, sinon l'exception
   "OSError" est levée. Si *dst* existe déjà, il est remplacé. Les
   fichiers spéciaux comme les périphériques caractères ou bloc ainsi
   que les tubes (*pipes*) ne peuvent pas être copiés avec cette
   fonction.

   Si *follow_symlinks* est faux et *src* est un lien symbolique, un
   nouveau lien symbolique est créé au lieu de copier le fichier
   pointé par *src*.

   Raises an auditing event "shutil.copyfile" with arguments "src",
   "dst".

   Modifié dans la version 3.3: "IOError" était levée au lieu de
   "OSError". Ajout de l'argument *follow_symlinks*. Maintenant
   renvoie *dst*.

   Modifié dans la version 3.4: Lève "SameFileError" au lieu de
   "Error". Puisque la première est une sous-classe de la seconde, le
   changement assure la rétrocompatibilité.

   Modifié dans la version 3.8: Platform-specific fast-copy syscalls
   may be used internally in order to copy the file more efficiently.
   See Platform-dependent efficient copy operations section.

exception shutil.SameFileError

   Cette exception est levée si la source et la destination dans
   "copyfile()" sont le même fichier.

   Nouveau dans la version 3.4.

shutil.copymode(src, dst, *, follow_symlinks=True)

   Copy the permission bits from *src* to *dst*.  The file contents,
   owner, and group are unaffected.  *src* and *dst* are path-like
   objects or path names given as strings. If *follow_symlinks* is
   false, and both *src* and *dst* are symbolic links, "copymode()"
   will attempt to modify the mode of *dst* itself (rather than the
   file it points to).  This functionality is not available on every
   platform; please see "copystat()" for more information.  If
   "copymode()" cannot modify symbolic links on the local platform,
   and it is asked to do so, it will do nothing and return.

   Raises an auditing event "shutil.copymode" with arguments "src",
   "dst".

   Modifié dans la version 3.3: L'argument *follow_symlinks* a été
   ajouté.

shutil.copystat(src, dst, *, follow_symlinks=True)

   Copy the permission bits, last access time, last modification time,
   and flags from *src* to *dst*.  On Linux, "copystat()" also copies
   the "extended attributes" where possible.  The file contents,
   owner, and group are unaffected.  *src* and *dst* are path-like
   objects or path names given as strings.

   Si *follow_symlinks* est faux et *src* et *dst* représentent des
   liens symboliques, "copystat()" agit sur les liens symboliques au
   lieu des fichiers cibles — elle lit les informations du lien
   symbolique de *src* et les écrit vers la destination pointée par
   *dst*.

   Note:

     Toutes les plateformes n'offrent pas la possibilité d'examiner et
     modifier les liens symboliques. Python peut vous informer des
     fonctionnalités effectivement disponibles.

     * Si "os.chmod in os.supports_follow_symlinks" est "True",
       "copystat()" peut modifier les octets de droits d'accès du lien
       symbolique.

     * If "os.utime in os.supports_follow_symlinks" is "True",
       "copystat()" can modify the last access and modification times
       of a symbolic link.

     * If "os.chflags in os.supports_follow_symlinks" is "True",
       "copystat()" can modify the flags of a symbolic link.
       ("os.chflags" is not available on all platforms.)

     On platforms where some or all of this functionality is
     unavailable, when asked to modify a symbolic link, "copystat()"
     will copy everything it can. "copystat()" never returns
     failure.Please see "os.supports_follow_symlinks" for more
     information.

   Raises an auditing event "shutil.copystat" with arguments "src",
   "dst".

   Modifié dans la version 3.3: Added *follow_symlinks* argument and
   support for Linux extended attributes.

shutil.copy(src, dst, *, follow_symlinks=True)

   Copies the file *src* to the file or directory *dst*.  *src* and
   *dst* should be *path-like objects* or strings.  If *dst* specifies
   a directory, the file will be copied into *dst* using the base
   filename from *src*. If *dst* specifies a file that already exists,
   it will be replaced. Returns the path to the newly created file.

   If *follow_symlinks* is false, and *src* is a symbolic link, *dst*
   will be created as a symbolic link.  If *follow_symlinks* is true
   and *src* is a symbolic link, *dst* will be a copy of the file
   *src* refers to.

   "copy()" copies the file data and the file's permission mode (see
   "os.chmod()").  Other metadata, like the file's creation and
   modification times, is not preserved. To preserve all file metadata
   from the original, use "copy2()" instead.

   Raises an auditing event "shutil.copyfile" with arguments "src",
   "dst".

   Raises an auditing event "shutil.copymode" with arguments "src",
   "dst".

   Modifié dans la version 3.3: Added *follow_symlinks* argument. Now
   returns path to the newly created file.

   Modifié dans la version 3.8: Platform-specific fast-copy syscalls
   may be used internally in order to copy the file more efficiently.
   See Platform-dependent efficient copy operations section.

shutil.copy2(src, dst, *, follow_symlinks=True)

   Identical to "copy()" except that "copy2()" also attempts to
   preserve file metadata.

   When *follow_symlinks* is false, and *src* is a symbolic link,
   "copy2()" attempts to copy all metadata from the *src* symbolic
   link to the newly created *dst* symbolic link. However, this
   functionality is not available on all platforms. On platforms where
   some or all of this functionality is unavailable, "copy2()" will
   preserve all the metadata it can; "copy2()" never raises an
   exception because it cannot preserve file metadata.

   "copy2()" uses "copystat()" to copy the file metadata. Please see
   "copystat()" for more information about platform support for
   modifying symbolic link metadata.

   Raises an auditing event "shutil.copyfile" with arguments "src",
   "dst".

   Raises an auditing event "shutil.copystat" with arguments "src",
   "dst".

   Modifié dans la version 3.3: Added *follow_symlinks* argument, try
   to copy extended file system attributes too (currently Linux only).
   Now returns path to the newly created file.

   Modifié dans la version 3.8: Platform-specific fast-copy syscalls
   may be used internally in order to copy the file more efficiently.
   See Platform-dependent efficient copy operations section.

shutil.ignore_patterns(*patterns)

   This factory function creates a function that can be used as a
   callable for "copytree()"'s *ignore* argument, ignoring files and
   directories that match one of the glob-style *patterns* provided.
   See the example below.

shutil.copytree(src, dst, symlinks=False, ignore=None, copy_function=copy2, ignore_dangling_symlinks=False, dirs_exist_ok=False)

   Recursively copy an entire directory tree rooted at *src* to a
   directory named *dst* and return the destination directory.  All
   intermediate directories needed to contain *dst* will also be
   created by default.

   Permissions and times of directories are copied with "copystat()",
   individual files are copied using "copy2()".

   If *symlinks* is true, symbolic links in the source tree are
   represented as symbolic links in the new tree and the metadata of
   the original links will be copied as far as the platform allows; if
   false or omitted, the contents and metadata of the linked files are
   copied to the new tree.

   When *symlinks* is false, if the file pointed by the symlink
   doesn't exist, an exception will be added in the list of errors
   raised in an "Error" exception at the end of the copy process. You
   can set the optional *ignore_dangling_symlinks* flag to true if you
   want to silence this exception. Notice that this option has no
   effect on platforms that don't support "os.symlink()".

   If *ignore* is given, it must be a callable that will receive as
   its arguments the directory being visited by "copytree()", and a
   list of its contents, as returned by "os.listdir()".  Since
   "copytree()" is called recursively, the *ignore* callable will be
   called once for each directory that is copied.  The callable must
   return a sequence of directory and file names relative to the
   current directory (i.e. a subset of the items in its second
   argument); these names will then be ignored in the copy process.
   "ignore_patterns()" can be used to create such a callable that
   ignores names based on glob-style patterns.

   If exception(s) occur, an "Error" is raised with a list of reasons.

   If *copy_function* is given, it must be a callable that will be
   used to copy each file. It will be called with the source path and
   the destination path as arguments. By default, "copy2()" is used,
   but any function that supports the same signature (like "copy()")
   can be used.

   If *dirs_exist_ok* is false (the default) and *dst* already exists,
   a "FileExistsError" is raised. If *dirs_exist_ok* is true, the
   copying operation will continue if it encounters existing
   directories, and files within the *dst* tree will be overwritten by
   corresponding files from the *src* tree.

   Raises an auditing event "shutil.copytree" with arguments "src",
   "dst".

   Modifié dans la version 3.3: Copy metadata when *symlinks* is
   false. Now returns *dst*.

   Modifié dans la version 3.2: Added the *copy_function* argument to
   be able to provide a custom copy function. Added the
   *ignore_dangling_symlinks* argument to silence dangling symlinks
   errors when *symlinks* is false.

   Modifié dans la version 3.8: Platform-specific fast-copy syscalls
   may be used internally in order to copy the file more efficiently.
   See Platform-dependent efficient copy operations section.

   Nouveau dans la version 3.8: The *dirs_exist_ok* parameter.

shutil.rmtree(path, ignore_errors=False, onerror=None)

   Delete an entire directory tree; *path* must point to a directory
   (but not a symbolic link to a directory).  If *ignore_errors* is
   true, errors resulting from failed removals will be ignored; if
   false or omitted, such errors are handled by calling a handler
   specified by *onerror* or, if that is omitted, they raise an
   exception.

   Note:

     On platforms that support the necessary fd-based functions a
     symlink attack resistant version of "rmtree()" is used by
     default.  On other platforms, the "rmtree()" implementation is
     susceptible to a symlink attack: given proper timing and
     circumstances, attackers can manipulate symlinks on the
     filesystem to delete files they wouldn't be able to access
     otherwise.  Applications can use the
     "rmtree.avoids_symlink_attacks" function attribute to determine
     which case applies.

   If *onerror* is provided, it must be a callable that accepts three
   parameters: *function*, *path*, and *excinfo*.

   The first parameter, *function*, is the function which raised the
   exception; it depends on the platform and implementation.  The
   second parameter, *path*, will be the path name passed to
   *function*.  The third parameter, *excinfo*, will be the exception
   information returned by "sys.exc_info()".  Exceptions raised by
   *onerror* will not be caught.

   Raises an auditing event "shutil.rmtree" with argument "path".

   Modifié dans la version 3.3: Added a symlink attack resistant
   version that is used automatically if platform supports fd-based
   functions.

   Modifié dans la version 3.8: On Windows, will no longer delete the
   contents of a directory junction before removing the junction.

   rmtree.avoids_symlink_attacks

      Indicates whether the current platform and implementation
      provides a symlink attack resistant version of "rmtree()".
      Currently this is only true for platforms supporting fd-based
      directory access functions.

      Nouveau dans la version 3.3.

shutil.move(src, dst, copy_function=copy2)

   Recursively move a file or directory (*src*) to another location
   (*dst*) and return the destination.

   If the destination is an existing directory, then *src* is moved
   inside that directory. If the destination already exists but is not
   a directory, it may be overwritten depending on "os.rename()"
   semantics.

   If the destination is on the current filesystem, then "os.rename()"
   is used. Otherwise, *src* is copied to *dst* using *copy_function*
   and then removed.  In case of symlinks, a new symlink pointing to
   the target of *src* will be created in or as *dst* and *src* will
   be removed.

   If *copy_function* is given, it must be a callable that takes two
   arguments *src* and *dst*, and will be used to copy *src* to *dst*
   if "os.rename()" cannot be used.  If the source is a directory,
   "copytree()" is called, passing it the "copy_function()". The
   default *copy_function* is "copy2()".  Using "copy()" as the
   *copy_function* allows the move to succeed when it is not possible
   to also copy the metadata, at the expense of not copying any of the
   metadata.

   Raises an auditing event "shutil.move" with arguments "src", "dst".

   Modifié dans la version 3.3: Added explicit symlink handling for
   foreign filesystems, thus adapting it to the behavior of GNU's
   **mv**. Now returns *dst*.

   Modifié dans la version 3.5: Added the *copy_function* keyword
   argument.

   Modifié dans la version 3.8: Platform-specific fast-copy syscalls
   may be used internally in order to copy the file more efficiently.
   See Platform-dependent efficient copy operations section.

   Modifié dans la version 3.9: Accepts a *path-like object* for both
   *src* and *dst*.

shutil.disk_usage(path)

   Return disk usage statistics about the given path as a *named
   tuple* with the attributes *total*, *used* and *free*, which are
   the amount of total, used and free space, in bytes. *path* may be a
   file or a directory.

   Nouveau dans la version 3.3.

   Modifié dans la version 3.8: On Windows, *path* can now be a file
   or directory.

   Disponibilité : Unix, Windows.

shutil.chown(path, user=None, group=None)

   Change owner *user* and/or *group* of the given *path*.

   *user* can be a system user name or a uid; the same applies to
   *group*. At least one argument is required.

   See also "os.chown()", the underlying function.

   Raises an auditing event "shutil.chown" with arguments "path",
   "user", "group".

   Disponibilité : Unix.

   Nouveau dans la version 3.3.

shutil.which(cmd, mode=os.F_OK | os.X_OK, path=None)

   Return the path to an executable which would be run if the given
   *cmd* was called.  If no *cmd* would be called, return "None".

   *mode* is a permission mask passed to "os.access()", by default
   determining if the file exists and executable.

   When no *path* is specified, the results of "os.environ()" are
   used, returning either the "PATH" value or a fallback of
   "os.defpath".

   On Windows, the current directory is always prepended to the *path*
   whether or not you use the default or provide your own, which is
   the behavior the command shell uses when finding executables.
   Additionally, when finding the *cmd* in the *path*, the "PATHEXT"
   environment variable is checked.  For example, if you call
   "shutil.which("python")", "which()" will search "PATHEXT" to know
   that it should look for "python.exe" within the *path* directories.
   For example, on Windows:

      >>> shutil.which("python")
      'C:\\Python33\\python.EXE'

   Nouveau dans la version 3.3.

   Modifié dans la version 3.8: The "bytes" type is now accepted.  If
   *cmd* type is "bytes", the result type is also "bytes".

exception shutil.Error

   This exception collects exceptions that are raised during a multi-
   file operation. For "copytree()", the exception argument is a list
   of 3-tuples (*srcname*, *dstname*, *exception*).


Platform-dependent efficient copy operations
--------------------------------------------

Starting from Python 3.8, all functions involving a file copy
("copyfile()", "copy()", "copy2()", "copytree()", and "move()") may
use platform-specific "fast-copy" syscalls in order to copy the file
more efficiently (see bpo-33671). "fast-copy" means that the copying
operation occurs within the kernel, avoiding the use of userspace
buffers in Python as in ""outfd.write(infd.read())"".

On macOS fcopyfile is used to copy the file content (not metadata).

On Linux "os.sendfile()" is used.

On Windows "shutil.copyfile()" uses a bigger default buffer size (1
MiB instead of 64 KiB) and a "memoryview()"-based variant of
"shutil.copyfileobj()" is used.

If the fast-copy operation fails and no data was written in the
destination file then shutil will silently fallback on using less
efficient "copyfileobj()" function internally.

Modifié dans la version 3.8.


copytree example
----------------

An example that uses the "ignore_patterns()" helper:

   from shutil import copytree, ignore_patterns

   copytree(source, destination, ignore=ignore_patterns('*.pyc', 'tmp*'))

This will copy everything except ".pyc" files and files or directories
whose name starts with "tmp".

Another example that uses the *ignore* argument to add a logging call:

   from shutil import copytree
   import logging

   def _logpath(path, names):
       logging.info('Working in %s', path)
       return []   # nothing will be ignored

   copytree(source, destination, ignore=_logpath)


rmtree example
--------------

This example shows how to remove a directory tree on Windows where
some of the files have their read-only bit set. It uses the onerror
callback to clear the readonly bit and reattempt the remove. Any
subsequent failure will propagate.

   import os, stat
   import shutil

   def remove_readonly(func, path, _):
       "Clear the readonly bit and reattempt the removal"
       os.chmod(path, stat.S_IWRITE)
       func(path)

   shutil.rmtree(directory, onerror=remove_readonly)


Archiving operations
====================

Nouveau dans la version 3.2.

Modifié dans la version 3.5: Added support for the *xztar* format.

High-level utilities to create and read compressed and archived files
are also provided.  They rely on the "zipfile" and "tarfile" modules.

shutil.make_archive(base_name, format[, root_dir[, base_dir[, verbose[, dry_run[, owner[, group[, logger]]]]]]])

   Create an archive file (such as zip or tar) and return its name.

   *base_name* is the name of the file to create, including the path,
   minus any format-specific extension. *format* is the archive
   format: one of "zip" (if the "zlib" module is available), "tar",
   "gztar" (if the "zlib" module is available), "bztar" (if the "bz2"
   module is available), or "xztar" (if the "lzma" module is
   available).

   *root_dir* is a directory that will be the root directory of the
   archive, all paths in the archive will be relative to it; for
   example, we typically chdir into *root_dir* before creating the
   archive.

   *base_dir* is the directory where we start archiving from; i.e.
   *base_dir* will be the common prefix of all files and directories
   in the archive.  *base_dir* must be given relative to *root_dir*.
   See Archiving example with base_dir for how to use *base_dir* and
   *root_dir* together.

   *root_dir* and *base_dir* both default to the current directory.

   If *dry_run* is true, no archive is created, but the operations
   that would be executed are logged to *logger*.

   *owner* and *group* are used when creating a tar archive. By
   default, uses the current owner and group.

   *logger* must be an object compatible with **PEP 282**, usually an
   instance of "logging.Logger".

   The *verbose* argument is unused and deprecated.

   Raises an auditing event "shutil.make_archive" with arguments
   "base_name", "format", "root_dir", "base_dir".

   Note:

     This function is not thread-safe when custom archivers registered
     with "register_archive_format()" are used.  In this case it
     temporarily changes the current working directory of the process
     to perform archiving.

   Modifié dans la version 3.8: The modern pax (POSIX.1-2001) format
   is now used instead of the legacy GNU format for archives created
   with "format="tar"".

   Modifié dans la version 3.10.6: This function is now made thread-
   safe during creation of standard ".zip" and tar archives.

shutil.get_archive_formats()

   Return a list of supported formats for archiving. Each element of
   the returned sequence is a tuple "(name, description)".

   By default "shutil" provides these formats:

   * *zip*: ZIP file (if the "zlib" module is available).

   * *tar*: Uncompressed tar file. Uses POSIX.1-2001 pax format for
     new archives.

   * *gztar*: gzip'ed tar-file (if the "zlib" module is available).

   * *bztar*: bzip2'ed tar-file (if the "bz2" module is available).

   * *xztar*: xz'ed tar-file (if the "lzma" module is available).

   You can register new formats or provide your own archiver for any
   existing formats, by using "register_archive_format()".

shutil.register_archive_format(name, function[, extra_args[, description]])

   Register an archiver for the format *name*.

   *function* is the callable that will be used to unpack archives.
   The callable will receive the *base_name* of the file to create,
   followed by the *base_dir* (which defaults to "os.curdir") to start
   archiving from. Further arguments are passed as keyword arguments:
   *owner*, *group*, *dry_run* and *logger* (as passed in
   "make_archive()").

   If given, *extra_args* is a sequence of "(name, value)" pairs that
   will be used as extra keywords arguments when the archiver callable
   is used.

   *description* is used by "get_archive_formats()" which returns the
   list of archivers.  Defaults to an empty string.

shutil.unregister_archive_format(name)

   Remove the archive format *name* from the list of supported
   formats.

shutil.unpack_archive(filename[, extract_dir[, format[, filter]]])

   Unpack an archive. *filename* is the full path of the archive.

   *extract_dir* is the name of the target directory where the archive
   is unpacked. If not provided, the current working directory is
   used.

   *format* is the archive format: one of "zip", "tar", "gztar",
   "bztar", or "xztar".  Or any other format registered with
   "register_unpack_format()".  If not provided, "unpack_archive()"
   will use the archive file name extension and see if an unpacker was
   registered for that extension.  In case none is found, a
   "ValueError" is raised.

   The keyword-only *filter* argument, which was added in Python
   3.10.12, is passed to the underlying unpacking function. For zip
   files, *filter* is not accepted. For tar files, it is recommended
   to set it to "'data'", unless using features specific to tar and
   UNIX-like filesystems. (See Extraction filters for details.) The
   "'data'" filter will become the default for tar files in Python
   3.14.

   Raises an auditing event "shutil.unpack_archive" with arguments
   "filename", "extract_dir", "format".

   Avertissement:

     Never extract archives from untrusted sources without prior
     inspection. It is possible that files are created outside of the
     path specified in the *extract_dir* argument, e.g. members that
     have absolute filenames starting with "/" or filenames with two
     dots "..".

   Modifié dans la version 3.7: Accepts a *path-like object* for
   *filename* and *extract_dir*.

   Modifié dans la version 3.10.12: Added the *filter* argument.

shutil.register_unpack_format(name, extensions, function[, extra_args[, description]])

   Registers an unpack format. *name* is the name of the format and
   *extensions* is a list of extensions corresponding to the format,
   like ".zip" for Zip files.

   *function* is the callable that will be used to unpack archives.
   The callable will receive:

   * the path of the archive, as a positional argument;

   * the directory the archive must be extracted to, as a positional
     argument;

   * possibly a *filter* keyword argument, if it was given to
     "unpack_archive()";

   * additional keyword arguments, specified by *extra_args* as a
     sequence of "(name, value)" tuples.

   *description* can be provided to describe the format, and will be
   returned by the "get_unpack_formats()" function.

shutil.unregister_unpack_format(name)

   Unregister an unpack format. *name* is the name of the format.

shutil.get_unpack_formats()

   Return a list of all registered formats for unpacking. Each element
   of the returned sequence is a tuple "(name, extensions,
   description)".

   By default "shutil" provides these formats:

   * *zip*: ZIP file (unpacking compressed files works only if the
     corresponding module is available).

   * *tar*: uncompressed tar file.

   * *gztar*: gzip'ed tar-file (if the "zlib" module is available).

   * *bztar*: bzip2'ed tar-file (if the "bz2" module is available).

   * *xztar*: xz'ed tar-file (if the "lzma" module is available).

   You can register new formats or provide your own unpacker for any
   existing formats, by using "register_unpack_format()".


Archiving example
-----------------

In this example, we create a gzip'ed tar-file archive containing all
files found in the ".ssh" directory of the user:

   >>> from shutil import make_archive
   >>> import os
   >>> archive_name = os.path.expanduser(os.path.join('~', 'myarchive'))
   >>> root_dir = os.path.expanduser(os.path.join('~', '.ssh'))
   >>> make_archive(archive_name, 'gztar', root_dir)
   '/Users/tarek/myarchive.tar.gz'

The resulting archive contains:

   $ tar -tzvf /Users/tarek/myarchive.tar.gz
   drwx------ tarek/staff       0 2010-02-01 16:23:40 ./
   -rw-r--r-- tarek/staff     609 2008-06-09 13:26:54 ./authorized_keys
   -rwxr-xr-x tarek/staff      65 2008-06-09 13:26:54 ./config
   -rwx------ tarek/staff     668 2008-06-09 13:26:54 ./id_dsa
   -rwxr-xr-x tarek/staff     609 2008-06-09 13:26:54 ./id_dsa.pub
   -rw------- tarek/staff    1675 2008-06-09 13:26:54 ./id_rsa
   -rw-r--r-- tarek/staff     397 2008-06-09 13:26:54 ./id_rsa.pub
   -rw-r--r-- tarek/staff   37192 2010-02-06 18:23:10 ./known_hosts


Archiving example with *base_dir*
---------------------------------

In this example, similar to the one above, we show how to use
"make_archive()", but this time with the usage of *base_dir*.  We now
have the following directory structure:

   $ tree tmp
   tmp
   └── root
       └── structure
           ├── content
               └── please_add.txt
           └── do_not_add.txt

In the final archive, "please_add.txt" should be included, but
"do_not_add.txt" should not.  Therefore we use the following:

   >>> from shutil import make_archive
   >>> import os
   >>> archive_name = os.path.expanduser(os.path.join('~', 'myarchive'))
   >>> make_archive(
   ...     archive_name,
   ...     'tar',
   ...     root_dir='tmp/root',
   ...     base_dir='structure/content',
   ... )
   '/Users/tarek/my_archive.tar'

Listing the files in the resulting archive gives us:

   $ python -m tarfile -l /Users/tarek/myarchive.tar
   structure/content/
   structure/content/please_add.txt


Querying the size of the output terminal
========================================

shutil.get_terminal_size(fallback=(columns, lines))

   Get the size of the terminal window.

   For each of the two dimensions, the environment variable, "COLUMNS"
   and "LINES" respectively, is checked. If the variable is defined
   and the value is a positive integer, it is used.

   When "COLUMNS" or "LINES" is not defined, which is the common case,
   the terminal connected to "sys.__stdout__" is queried by invoking
   "os.get_terminal_size()".

   If the terminal size cannot be successfully queried, either because
   the system doesn't support querying, or because we are not
   connected to a terminal, the value given in "fallback" parameter is
   used. "fallback" defaults to "(80, 24)" which is the default size
   used by many terminal emulators.

   The value returned is a named tuple of type "os.terminal_size".

   See also: The Single UNIX Specification, Version 2, Other
   Environment Variables.

   Nouveau dans la version 3.3.
