20.11. nntplib — NNTP protocol client¶
Source code: Lib/nntplib.py
This module defines the class NNTP which implements the client side of
the NNTP protocol. It can be used to implement a news reader or poster, or
automated news processors. For more information on NNTP (Network News Transfer
Protocol), see Internet RFC 977.
Here are two small examples of how it can be used. To list some statistics about a newsgroup and print the subjects of the last 10 articles:
>>> s = NNTP('news.gmane.org')
>>> resp, count, first, last, name = s.group('gmane.comp.python.committers')
>>> print 'Group', name, 'has', count, 'articles, range', first, 'to', last
Group gmane.comp.python.committers has 1071 articles, range 1 to 1071
>>> resp, subs = s.xhdr('subject', first + '-' + last)
>>> for id, sub in subs[-10:]: print id, sub
...
1062 Re: Mercurial Status?
1063 Re: [python-committers] (Windows) buildbots on 3.x
1064 Re: Mercurial Status?
1065 Re: Mercurial Status?
1066 Python 2.6.6 status
1067 Commit Privileges for Ask Solem
1068 Re: Commit Privileges for Ask Solem
1069 Re: Commit Privileges for Ask Solem
1070 Re: Commit Privileges for Ask Solem
1071 2.6.6 rc 2
>>> s.quit()
'205 Bye!'
To post an article from a file (this assumes that the article has valid headers, and that you have right to post on the particular newsgroup):
>>> s = NNTP('news.gmane.org')
>>> f = open('articlefile')
>>> s.post(f)
'240 Article posted successfully.'
>>> s.quit()
'205 Bye!'
The module itself defines the following items:
-
class
nntplib.NNTP(host[, port [, user[, password [, readermode] [, usenetrc]]]])¶ Return a new instance of the
NNTPclass, representing a connection to the NNTP server running on host host, listening at port port. The default port is 119. If the optional user and password are provided, or if suitable credentials are present in/.netrcand the optional flag usenetrc is true (the default), theAUTHINFO USERandAUTHINFO PASScommands are used to identify and authenticate the user to the server. If the optional flag readermode is true, then amode readercommand is sent before authentication is performed. Reader mode is sometimes necessary if you are connecting to an NNTP server on the local machine and intend to call reader-specific commands, such asgroup. If you get unexpectedNNTPPermanentErrors, you might need to set readermode. readermode defaults toNone. usenetrc defaults toTrue.Changed in version 2.4: usenetrc argument added.
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exception
nntplib.NNTPError¶ Derived from the standard exception
Exception, this is the base class for all exceptions raised by thenntplibmodule.
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exception
nntplib.NNTPReplyError¶ Exception raised when an unexpected reply is received from the server. For backwards compatibility, the exception
error_replyis equivalent to this class.
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exception
nntplib.NNTPTemporaryError¶ Exception raised when an error code in the range 400–499 is received. For backwards compatibility, the exception
error_tempis equivalent to this class.
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exception
nntplib.NNTPPermanentError¶ Exception raised when an error code in the range 500–599 is received. For backwards compatibility, the exception
error_permis equivalent to this class.
-
exception
nntplib.NNTPProtocolError¶ Exception raised when a reply is received from the server that does not begin with a digit in the range 1–5. For backwards compatibility, the exception
error_protois equivalent to this class.
-
exception
nntplib.NNTPDataError¶ Exception raised when there is some error in the response data. For backwards compatibility, the exception
error_datais equivalent to this class.
20.11.1. NNTP Objects¶
NNTP instances have the following methods. The response that is returned as the first item in the return tuple of almost all methods is the server’s response: a string beginning with a three-digit code. If the server’s response indicates an error, the method raises one of the above exceptions.
-
NNTP.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.)
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NNTP.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 of1produces a moderate amount of debugging output, generally a single line per request or response. A value of2or higher produces the maximum amount of debugging output, logging each line sent and received on the connection (including message text).
-
NNTP.newgroups(date, time[, file])¶ Send a
NEWGROUPScommand. The date argument should be a string of the form'yymmdd'indicating the date, and time should be a string of the form'hhmmss'indicating the time. Return a pair(response, groups)where groups is a list of group names that are new since the given date and time. If the file parameter is supplied, then the output of theNEWGROUPScommand is stored in a file. If file is a string, then the method will open a file object with that name, write to it then close it. If file is a file object, then it will start callingwrite()on it to store the lines of the command output. If file is supplied, then the returned list is an empty list.
-
NNTP.newnews(group, date, time[, file])¶ Send a
NEWNEWScommand. Here, group is a group name or'*', and date and time have the same meaning as fornewgroups(). Return a pair(response, articles)where articles is a list of message ids. If the file parameter is supplied, then the output of theNEWNEWScommand is stored in a file. If file is a string, then the method will open a file object with that name, write to it then close it. If file is a file object, then it will start callingwrite()on it to store the lines of the command output. If file is supplied, then the returned list is an empty list.
-
NNTP.list([file])¶ Send a
LISTcommand. Return a pair(response, list)where list is a list of tuples. Each tuple has the form(group, last, first, flag), where group is a group name, last and first are the last and first article numbers (as strings), and flag is'y'if posting is allowed,'n'if not, and'm'if the newsgroup is moderated. (Note the ordering: last, first.) If the file parameter is supplied, then the output of theLISTcommand is stored in a file. If file is a string, then the method will open a file object with that name, write to it then close it. If file is a file object, then it will start callingwrite()on it to store the lines of the command output. If file is supplied, then the returned list is an empty list.
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NNTP.descriptions(grouppattern)¶ Send a
LIST NEWSGROUPScommand, where grouppattern is a wildmat string as specified in RFC2980 (it’s essentially the same as DOS or UNIX shell wildcard strings). Return a pair(response, list), where list is a list of tuples containing(name, title).New in version 2.4.
-
NNTP.description(group)¶ Get a description for a single group group. If more than one group matches (if ‘group’ is a real wildmat string), return the first match. If no group matches, return an empty string.
This elides the response code from the server. If the response code is needed, use
descriptions().New in version 2.4.
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NNTP.group(name)¶ Send a
GROUPcommand, where name is the group name. Return a tuple(response, count, first, last, name)where count is the (estimated) number of articles in the group, first is the first article number in the group, last is the last article number in the group, and name is the group name. The numbers are returned as strings.
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NNTP.help([file])¶ Send a
HELPcommand. Return a pair(response, list)where list is a list of help strings. If the file parameter is supplied, then the output of theHELPcommand is stored in a file. If file is a string, then the method will open a file object with that name, write to it then close it. If file is a file object, then it will start callingwrite()on it to store the lines of the command output. If file is supplied, then the returned list is an empty list.
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NNTP.stat(id)¶ Send a
STATcommand, where id is the message id (enclosed in'<'and'>') or an article number (as a string). Return a triple(response, number, id)where number is the article number (as a string) and id is the message id (enclosed in'<'and'>').
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NNTP.head(id)¶ Send a
HEADcommand, where id has the same meaning as forstat(). Return a tuple(response, number, id, list)where the first three are the same as forstat(), and list is a list of the article’s headers (an uninterpreted list of lines, without trailing newlines).
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NNTP.body(id[, file])¶ Send a
BODYcommand, where id has the same meaning as forstat(). If the file parameter is supplied, then the body is stored in a file. If file is a string, then the method will open a file object with that name, write to it then close it. If file is a file object, then it will start callingwrite()on it to store the lines of the body. Return as forhead(). If file is supplied, then the returned list is an empty list.
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NNTP.article(id)¶ Send an
ARTICLEcommand, where id has the same meaning as forstat(). Return as forhead().
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NNTP.slave()¶ Send a
SLAVEcommand. Return the server’s response.
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NNTP.xhdr(header, string[, file])¶ Send an
XHDRcommand. This command is not defined in the RFC but is a common extension. The header argument is a header keyword, e.g.'subject'. The string argument should have the form'first-last'where first and last are the first and last article numbers to search. Return a pair(response, list), where list is a list of pairs(id, text), where id is an article number (as a string) and text is the text of the requested header for that article. If the file parameter is supplied, then the output of theXHDRcommand is stored in a file. If file is a string, then the method will open a file object with that name, write to it then close it. If file is a file object, then it will start callingwrite()on it to store the lines of the command output. If file is supplied, then the returned list is an empty list.
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NNTP.post(file)¶ Post an article using the
POSTcommand. The file argument is an open file object which is read until EOF using itsreadline()method. It should be a well-formed news article, including the required headers. Thepost()method automatically escapes lines beginning with..
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NNTP.ihave(id, file)¶ Send an
IHAVEcommand. id is a message id (enclosed in'<'and'>'). If the response is not an error, treat file exactly as for thepost()method.
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NNTP.date()¶ Return a triple
(response, date, time), containing the current date and time in a form suitable for thenewnews()andnewgroups()methods. This is an optional NNTP extension, and may not be supported by all servers.
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NNTP.xgtitle(name[, file])¶ Process an
XGTITLEcommand, returning a pair(response, list), where list is a list of tuples containing(name, title). If the file parameter is supplied, then the output of theXGTITLEcommand is stored in a file. If file is a string, then the method will open a file object with that name, write to it then close it. If file is a file object, then it will start callingwrite()on it to store the lines of the command output. If file is supplied, then the returned list is an empty list. This is an optional NNTP extension, and may not be supported by all servers.RFC2980 says “It is suggested that this extension be deprecated”. Use
descriptions()ordescription()instead.
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NNTP.xover(start, end[, file])¶ Return a pair
(resp, list). list is a list of tuples, one for each article in the range delimited by the start and end article numbers. Each tuple is of the form(article number, subject, poster, date, id, references, size, lines). If the file parameter is supplied, then the output of theXOVERcommand is stored in a file. If file is a string, then the method will open a file object with that name, write to it then close it. If file is a file object, then it will start callingwrite()on it to store the lines of the command output. If file is supplied, then the returned list is an empty list. This is an optional NNTP extension, and may not be supported by all servers.
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NNTP.xpath(id)¶ Return a pair
(resp, path), where path is the directory path to the article with message ID id. This is an optional NNTP extension, and may not be supported by all servers.
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NNTP.quit()¶ Send a
QUITcommand and close the connection. Once this method has been called, no other methods of the NNTP object should be called.
