mirror of https://github.com/python/cpython
318 lines
12 KiB
ReStructuredText
318 lines
12 KiB
ReStructuredText
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:mod:`ftplib` --- FTP protocol client
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=====================================
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.. module:: ftplib
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:synopsis: FTP protocol client (requires sockets).
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.. index::
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pair: FTP; protocol
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single: FTP; ftplib (standard module)
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This module defines the class :class:`FTP` and a few related items. The
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:class:`FTP` class implements the client side of the FTP protocol. You can use
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this to write Python programs that perform a variety of automated FTP jobs, such
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as mirroring other ftp servers. It is also used by the module :mod:`urllib` to
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handle URLs that use FTP. For more information on FTP (File Transfer Protocol),
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see Internet :rfc:`959`.
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Here's a sample session using the :mod:`ftplib` module::
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>>> from ftplib import FTP
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>>> ftp = FTP('ftp.cwi.nl') # connect to host, default port
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>>> ftp.login() # user anonymous, passwd anonymous@
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>>> ftp.retrlines('LIST') # list directory contents
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total 24418
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drwxrwsr-x 5 ftp-usr pdmaint 1536 Mar 20 09:48 .
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dr-xr-srwt 105 ftp-usr pdmaint 1536 Mar 21 14:32 ..
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-rw-r--r-- 1 ftp-usr pdmaint 5305 Mar 20 09:48 INDEX
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.
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.
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.
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>>> ftp.retrbinary('RETR README', open('README', 'wb').write)
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'226 Transfer complete.'
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>>> ftp.quit()
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The module defines the following items:
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.. class:: FTP([host[, user[, passwd[, acct[, timeout]]]]])
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Return a new instance of the :class:`FTP` class. When *host* is given, the
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method call ``connect(host)`` is made. When *user* is given, additionally
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the method call ``login(user, passwd, acct)`` is made (where *passwd* and
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*acct* default to the empty string when not given). The optional *timeout*
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parameter specifies a timeout in seconds for blocking operations like the
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connection attempt (if is not specified, or passed as None, the global
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default timeout setting will be used).
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.. attribute:: all_errors
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The set of all exceptions (as a tuple) that methods of :class:`FTP`
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instances may raise as a result of problems with the FTP connection (as
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opposed to programming errors made by the caller). This set includes the
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four exceptions listed below as well as :exc:`socket.error` and
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:exc:`IOError`.
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.. exception:: error_reply
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Exception raised when an unexpected reply is received from the server.
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.. exception:: error_temp
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Exception raised when an error code in the range 400--499 is received.
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.. exception:: error_perm
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Exception raised when an error code in the range 500--599 is received.
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.. exception:: error_proto
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Exception raised when a reply is received from the server that does not
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begin with a digit in the range 1--5.
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.. seealso::
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Module :mod:`netrc`
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Parser for the :file:`.netrc` file format. The file :file:`.netrc` is typically
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used by FTP clients to load user authentication information before prompting the
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user.
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.. index:: single: ftpmirror.py
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The file :file:`Tools/scripts/ftpmirror.py` in the Python source distribution is
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a script that can mirror FTP sites, or portions thereof, using the :mod:`ftplib`
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module. It can be used as an extended example that applies this module.
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.. _ftp-objects:
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FTP Objects
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-----------
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Several methods are available in two flavors: one for handling text files and
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another for binary files. These are named for the command which is used
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followed by ``lines`` for the text version or ``binary`` for the binary version.
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:class:`FTP` instances have the following methods:
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.. method:: FTP.set_debuglevel(level)
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Set the instance's debugging level. This controls the amount of debugging
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output printed. The default, ``0``, produces no debugging output. A value of
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``1`` produces a moderate amount of debugging output, generally a single line
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per request. A value of ``2`` or higher produces the maximum amount of
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debugging output, logging each line sent and received on the control connection.
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.. method:: FTP.connect(host[, port[, timeout]])
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Connect to the given host and port. The default port number is ``21``, as
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specified by the FTP protocol specification. It is rarely needed to specify a
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different port number. This function should be called only once for each
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instance; it should not be called at all if a host was given when the instance
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was created. All other methods can only be used after a connection has been
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made.
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The optional *timeout* parameter specifies a timeout in seconds for the
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connection attempt. If is not specified, or passed as None, the object
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timeout is used (the timeout that you passed when instantiating the class);
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if the object timeout is also None, the global default timeout setting will
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be used.
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.. method:: FTP.getwelcome()
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Return the welcome message sent by the server in reply to the initial
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connection. (This message sometimes contains disclaimers or help information
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that may be relevant to the user.)
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.. method:: FTP.login([user[, passwd[, acct]]])
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Log in as the given *user*. The *passwd* and *acct* parameters are optional and
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default to the empty string. If no *user* is specified, it defaults to
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``'anonymous'``. If *user* is ``'anonymous'``, the default *passwd* is
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``'anonymous@'``. This function should be called only once for each instance,
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after a connection has been established; it should not be called at all if a
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host and user were given when the instance was created. Most FTP commands are
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only allowed after the client has logged in.
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.. method:: FTP.abort()
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Abort a file transfer that is in progress. Using this does not always work, but
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it's worth a try.
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.. method:: FTP.sendcmd(command)
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Send a simple command string to the server and return the response string.
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.. method:: FTP.voidcmd(command)
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Send a simple command string to the server and handle the response. Return
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nothing if a response code in the range 200--299 is received. Raise an exception
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otherwise.
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.. method:: FTP.retrbinary(command, callback[, maxblocksize[, rest]])
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Retrieve a file in binary transfer mode. *command* should be an appropriate
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``RETR`` command: ``'RETR filename'``. The *callback* function is called for
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each block of data received, with a single string argument giving the data
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block. The optional *maxblocksize* argument specifies the maximum chunk size to
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read on the low-level socket object created to do the actual transfer (which
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will also be the largest size of the data blocks passed to *callback*). A
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reasonable default is chosen. *rest* means the same thing as in the
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:meth:`transfercmd` method.
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.. method:: FTP.retrlines(command[, callback])
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Retrieve a file or directory listing in ASCII transfer mode. *command*
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should be an appropriate ``RETR`` command (see :meth:`retrbinary`) or a
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command such as ``LIST``, ``NLST`` or ``MLSD`` (usually just the string
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``'LIST'``). The *callback* function is called for each line, with the
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trailing CRLF stripped. The default *callback* prints the line to
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``sys.stdout``.
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.. method:: FTP.set_pasv(boolean)
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Enable "passive" mode if *boolean* is true, other disable passive mode.
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Passive mode is on by default.
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.. method:: FTP.storbinary(command, file[, blocksize, callback])
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Store a file in binary transfer mode. *command* should be an appropriate
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``STOR`` command: ``"STOR filename"``. *file* is an open file object which is
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read until EOF using its :meth:`read` method in blocks of size *blocksize* to
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provide the data to be stored. The *blocksize* argument defaults to 8192.
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*callback* is an optional single parameter callable that is called
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on each block of data after it is sent.
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.. method:: FTP.storlines(command, file[, callback])
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Store a file in ASCII transfer mode. *command* should be an appropriate
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``STOR`` command (see :meth:`storbinary`). Lines are read until EOF from the
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open file object *file* using its :meth:`readline` method to provide the data to
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be stored. *callback* is an optional single parameter callable
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that is called on each line after it is sent.
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.. method:: FTP.transfercmd(cmd[, rest])
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Initiate a transfer over the data connection. If the transfer is active, send a
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``EPRT`` or ``PORT`` command and the transfer command specified by *cmd*, and
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accept the connection. If the server is passive, send a ``EPSV`` or ``PASV``
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command, connect to it, and start the transfer command. Either way, return the
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socket for the connection.
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If optional *rest* is given, a ``REST`` command is sent to the server, passing
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*rest* as an argument. *rest* is usually a byte offset into the requested file,
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telling the server to restart sending the file's bytes at the requested offset,
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skipping over the initial bytes. Note however that RFC 959 requires only that
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*rest* be a string containing characters in the printable range from ASCII code
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33 to ASCII code 126. The :meth:`transfercmd` method, therefore, converts
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*rest* to a string, but no check is performed on the string's contents. If the
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server does not recognize the ``REST`` command, an :exc:`error_reply` exception
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will be raised. If this happens, simply call :meth:`transfercmd` without a
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*rest* argument.
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.. method:: FTP.ntransfercmd(cmd[, rest])
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Like :meth:`transfercmd`, but returns a tuple of the data connection and the
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expected size of the data. If the expected size could not be computed, ``None``
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will be returned as the expected size. *cmd* and *rest* means the same thing as
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in :meth:`transfercmd`.
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.. method:: FTP.nlst(argument[, ...])
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Return a list of files as returned by the ``NLST`` command. The optional
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*argument* is a directory to list (default is the current server directory).
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Multiple arguments can be used to pass non-standard options to the ``NLST``
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command.
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.. method:: FTP.dir(argument[, ...])
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Produce a directory listing as returned by the ``LIST`` command, printing it to
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standard output. The optional *argument* is a directory to list (default is the
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current server directory). Multiple arguments can be used to pass non-standard
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options to the ``LIST`` command. If the last argument is a function, it is used
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as a *callback* function as for :meth:`retrlines`; the default prints to
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``sys.stdout``. This method returns ``None``.
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.. method:: FTP.rename(fromname, toname)
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Rename file *fromname* on the server to *toname*.
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.. method:: FTP.delete(filename)
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Remove the file named *filename* from the server. If successful, returns the
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text of the response, otherwise raises :exc:`error_perm` on permission errors or
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:exc:`error_reply` on other errors.
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.. method:: FTP.cwd(pathname)
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Set the current directory on the server.
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.. method:: FTP.mkd(pathname)
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Create a new directory on the server.
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.. method:: FTP.pwd()
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Return the pathname of the current directory on the server.
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.. method:: FTP.rmd(dirname)
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Remove the directory named *dirname* on the server.
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.. method:: FTP.size(filename)
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Request the size of the file named *filename* on the server. On success, the
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size of the file is returned as an integer, otherwise ``None`` is returned.
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Note that the ``SIZE`` command is not standardized, but is supported by many
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common server implementations.
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.. method:: FTP.quit()
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Send a ``QUIT`` command to the server and close the connection. This is the
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"polite" way to close a connection, but it may raise an exception of the server
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reponds with an error to the ``QUIT`` command. This implies a call to the
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:meth:`close` method which renders the :class:`FTP` instance useless for
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subsequent calls (see below).
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.. method:: FTP.close()
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Close the connection unilaterally. This should not be applied to an already
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closed connection such as after a successful call to :meth:`quit`. After this
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call the :class:`FTP` instance should not be used any more (after a call to
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:meth:`close` or :meth:`quit` you cannot reopen the connection by issuing
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another :meth:`login` method).
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