11.6.1 FTP Objects

Several methods are available in two flavors: one for handling text files and another for binary files. These are named for the command which is used followed by "lines" for the text version or "binary" for the binary version.

FTP instances have the following methods:

set_debuglevel(level): Set the instance's debugging level. This controls the amount of debugging output printed. The default, 0, produces no debugging output. A value of 1 produces a moderate amount of debugging output, generally a single line per request. A value of 2 or higher produces the maximum amount of debugging output, logging each line sent and received on the control connection.

connect(host[, port]): Connect to the given host and port. The default port number is 21, as specified by the FTP protocol specification. It is rarely needed to specify a different port number. This function should be called only once for each instance; it should not be called at all if a host was given when the instance was created. All other methods can only be used after a connection has been made.

getwelcome(): Return the welcome message sent by the server in reply to the initial connection. (This message sometimes contains disclaimers or help information that may be relevant to the user.)

login([user[, passwd[, acct]]]): Log in as the given user. The passwd and acct parameters are optional and default to the empty string. If no user is specified, it defaults to 'anonymous'. If user is 'anonymous', the default passwd is "realuser@host" where realuser is the real user name (glanced from the LOGNAME or USER environment variable) and host is the hostname as returned by socket.gethostname(). This function should be called only once for each instance, after a connection has been established; it should not be called at all if a host and user were given when the instance was created. Most FTP commands are only allowed after the client has logged in.

abort(): Abort a file transfer that is in progress. Using this does not always work, but it's worth a try.

sendcmd(command): Send a simple command string to the server and return the response string.

voidcmd(command): Send a simple command string to the server and handle the response. Return nothing if a response code in the range 200-299 is received. Raise an exception otherwise.

retrbinary(command, callback[, maxblocksize[, rest]]): Retrieve a file in binary transfer mode. command should be an appropriate "RETR" command, i.e. 'RETR filename'. The callback function is called for each block of data received, with a single string argument giving the data block. The optional maxblocksize argument specifies the maximum chunk size to read on the low-level socket object created to do the actual transfer (which will also be the largest size of the data blocks passed to callback). A reasonable default is chosen. rest means the same thing as in the transfercmd() method.

retrlines(command[, callback]): Retrieve a file or directory listing in ASCII transfer mode. command should be an appropriate "RETR" command (see retrbinary() or a "LIST" command (usually just the string 'LIST'). The callback function is called for each line, with the trailing CRLF stripped. The default callback prints the line to sys.stdout.

set_pasv(boolean): Enable ``passive'' mode if boolean is true, other disable passive mode. (In Python 2.0 and before, passive mode was off by default; in Python 2.1 and later, it is on by default.)

storbinary(command, file[, blocksize]): Store a file in binary transfer mode. command should be an appropriate "STOR" command, i.e. "STOR filename". file is an open file object which is read until EOF using its read() method in blocks of size blocksize to provide the data to be stored. The blocksize argument defaults to 8192. Changed in version 2.1: default for blocksize added.

storlines(command, file): Store a file in ASCII transfer mode. command should be an appropriate "STOR" command (see storbinary()). Lines are read until EOF from the open file object file using its readline() method to provide the data to be stored.

transfercmd(cmd[, rest]): Initiate a transfer over the data connection. If the transfer is active, send a "PORT" command and the transfer command specified by cmd, and accept the connection. If the server is passive, send a "PASV" command, connect to it, and start the transfer command. Either way, return the socket for the connection.
If optional rest is given, a "REST" command is sent to the server, passing rest as an argument. rest is usually a byte offset into the requested file, telling the server to restart sending the file's bytes at the requested offset, skipping over the initial bytes. Note however that RFC 959 requires only that rest be a string containing characters in the printable range from ASCII code 33 to ASCII code 126. The transfercmd() method, therefore, converts rest to a string, but no check is performed on the string's contents. If the server does not recognize the "REST" command, an error_reply exception will be raised. If this happens, simply call transfercmd() without a rest argument.

ntransfercmd(cmd[, rest]): Like transfercmd(), but returns a tuple of the data connection and the expected size of the data. If the expected size could not be computed, None will be returned as the expected size. cmd and rest means the same thing as in transfercmd().

nlst(argument[,...]): Return a list of files as returned by the "NLST" command. The optional argument is a directory to list (default is the current server directory). Multiple arguments can be used to pass non-standard options to the "NLST" command.

dir(argument[,...]): Produce a directory listing as returned by the "LIST" command, printing it to standard output. The optional argument is a directory to list (default is the current server directory). Multiple arguments can be used to pass non-standard options to the "LIST"command. If the last argument is a function, it is used as a callback function as for retrlines(); the default prints to sys.stdout. This method returns None.

rename(fromname, toname): Rename file fromname on the server to toname.

delete(filename): Remove the file named filename from the server. If successful, returns the text of the response, otherwise raises error_perm on permission errors or error_reply on other errors.

cwd(pathname): Set the current directory on the server.

mkd(pathname): Create a new directory on the server.

pwd(): Return the pathname of the current directory on the server.

rmd(dirname): Remove the directory named dirname on the server.

size(filename): Request the size of the file named filename on the server. On success, the size of the file is returned as an integer, otherwise None is returned. Note that the "SIZE" command is not standardized, but is supported by many common server implementations.

quit(): Send a "QUIT" command to the server and close the connection. This is the ``polite'' way to close a connection, but it may raise an exception of the server reponds with an error to the "QUIT" command. This implies a call to the close() method which renders the FTP instance useless for subsequent calls (see below).

close(): Close the connection unilaterally. This should not be applied to an already closed connection (e.g. after a successful call to quit(). After this call the FTP instance should not be used any more (i.e., after a call to close() or quit() you cannot reopen the connection by issuing another login() method).

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