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:mod:`netrc` --- netrc file processing
======================================

.. module:: netrc
   :synopsis: Loading of .netrc files.
.. moduleauthor:: Eric S. Raymond <esr@snark.thyrsus.com>
.. sectionauthor:: Eric S. Raymond <esr@snark.thyrsus.com>


.. versionadded:: 1.5.2

**Source code:** :source:`Lib/netrc.py`

--------------

The :class:`~netrc.netrc` class parses and encapsulates the netrc file format used by
the Unix :program:`ftp` program and other FTP clients.


.. class:: netrc([file])

   A :class:`~netrc.netrc` instance or subclass instance encapsulates data from  a netrc
   file.  The initialization argument, if present, specifies the file to parse.  If
   no argument is given, the file :file:`.netrc` in the user's home directory will
   be read.  Parse errors will raise :exc:`NetrcParseError` with diagnostic
   information including the file name, line number, and terminating token.
   If no argument is specified on a POSIX system, the presence of passwords in
   the :file:`.netrc` file will raise a :exc:`NetrcParseError` if the file
   ownership or permissions are insecure (owned by a user other than the user
   running the process, or accessible for read or write by any other user).
   This implements security behavior equivalent to that of ftp and other
   programs that use :file:`.netrc`.

   .. versionchanged:: 2.7.6 Added the POSIX permissions check.


.. exception:: NetrcParseError

   Exception raised by the :class:`~netrc.netrc` class when syntactical errors are
   encountered in source text.  Instances of this exception provide three
   interesting attributes:  :attr:`msg` is a textual explanation of the error,
   :attr:`filename` is the name of the source file, and :attr:`lineno` gives the
   line number on which the error was found.


.. _netrc-objects:

netrc Objects
-------------

A :class:`~netrc.netrc` instance has the following methods:


.. method:: netrc.authenticators(host)

   Return a 3-tuple ``(login, account, password)`` of authenticators for *host*.
   If the netrc file did not contain an entry for the given host, return the tuple
   associated with the 'default' entry.  If neither matching host nor default entry
   is available, return ``None``.


.. method:: netrc.__repr__()

   Dump the class data as a string in the format of a netrc file. (This discards
   comments and may reorder the entries.)

Instances of :class:`~netrc.netrc` have public instance variables:


.. attribute:: netrc.hosts

   Dictionary mapping host names to ``(login, account, password)`` tuples.  The
   'default' entry, if any, is represented as a pseudo-host by that name.


.. attribute:: netrc.macros

   Dictionary mapping macro names to string lists.

.. note::

   Passwords are limited to a subset of the ASCII character set. Versions of
   this module prior to 2.3 were extremely limited.  Starting with 2.3, all
   ASCII punctuation is allowed in passwords.  However, note that whitespace and
   non-printable characters are not allowed in passwords.  This is a limitation
   of the way the .netrc file is parsed and may be removed in the future.

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