doc/source/vmm_config.rst
author Pascal Volk <neverseen@users.sourceforge.net>
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:mod:`VirtualMailManager.Config` ---  Simplified configuration access
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======================================================================
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.. module:: VirtualMailManager.Config
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  :synopsis: Simplified configuration access
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.. moduleauthor:: Pascal Volk <neverseen@users.sourceforge.net>
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.. toctree::
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   :maxdepth: 2
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This module provides a few classes for simplified configuration handling
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and the validation of the setting's  *type* and *value*.
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:class:`LazyConfig` is derived from Python's
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:class:`ConfigParser.RawConfigParser`. It doesn't use ``RawConfigParser``'s
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``DEFAULT`` section. All settings and their defaults, if supposed, are
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handled by :class:`LazyConfigOption` objects in the :attr:`LazyConfig._cfg`
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*dict*.
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``LazyConfig``'s setters and getters for options are taking a single string
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for the *section* and *option* argument, e.g. ``config.pget('database.user')``
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instead of ``config.get('database', 'user')``.
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LazyConfig
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----------
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.. class:: LazyConfig
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  Bases: :class:`ConfigParser.RawConfigParser`
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  .. versionadded:: 0.6.0
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  .. attribute:: _cfg
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    a multi dimensional :class:`dict`, containing *sections* and *options*,
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    represented by :class:`LazyConfigOption` objects.
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    For example::
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      from VirtualMailManager.Config import LazyConfig, LazyConfigOption
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      class FooConfig(LazyConfig):
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          def __init__(self, ...):
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              LazyConfig.__init__(self)
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              ...
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              LCO = LazyConfigOption
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              self._cfg = {
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                  'database': {# section database:
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                      'host': LCO(str, '::1', self.get), # options of the
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                      'name': LCO(str, 'dbx', self.get), # database section.
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                      'pass': LCO(str, None, self.get),  # No defaults for the
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                      'user': LCO(str, None, self.get),  # user and pass options
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                  }
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              }
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          ...
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  .. method:: bool_new(value)
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    Converts the string *value* into a `bool` and returns it.
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    | ``'1'``, ``'on'``, ``'yes'`` and ``'true'`` will become :const:`True`
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    | ``'0'``, ``'off'``, ``'no'`` and ``'false'`` will become :const:`False`
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    :param value: one of the above mentioned strings
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    :type value: :obj:`basestring`
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    :rtype: bool
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    :raise ConfigValueError: for all other values, except ``bool``\ s
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  .. method:: dget(option)
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    Like :meth:`pget`, but returns the *option*'s default value, from
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    :attr:`_cfg` (defined by :attr:`LazyConfigOption.default`) if the *option*
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    is not configured in a ini-like configuration file.
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    :param option: the section.option combination
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    :type option: :obj:`basestring`
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    :raise NoDefaultError: if the *option* couldn't be found in the
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      configuration file and no default value was passed to
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      :class:`LazyConfigOption`'s constructor for the requested *option*.
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  .. method:: getboolean(section, option)
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    Returns the boolean value of the *option*, in the given *section*.
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    For a boolean :const:`True`, the value must be set to ``'1'``, ``'on'``,
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    ``'yes'``, ``'true'`` or :const:`True`. For a boolean :const:`False`, the
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    value must set to ``'0'``, ``'off'``, ``'no'``, ``'false'`` or
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    :const:`False`.
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    :param section: The section's name
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    :type section: :obj:`basestring`
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    :param option: The option's name
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    :type option: :obj:`basestring`
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    :rtype: bool
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    :raise ValueError: if the option has an other value than the values
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      mentioned above.
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  .. method:: has_option(option)
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    Checks if the *option* (section\ **.**\ option) is a known configuration
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    option.
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    :param option: The option's name
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    :type option: :obj:`basestring`
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    :rtype: bool
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  .. method:: has_section(section)
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    Checks if *section* is a known configuration section.
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    :param section: The section's name
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    :type section: :obj:`basestring`
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    :rtype: bool
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  .. method:: items(section)
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    Returns an iterator for ``key, value`` :obj:`tuple`\ s for each option in
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    the given *section*.
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    :param section: The section's name
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    :type section: :obj:`basestring`
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    :raise NoSectionError: if the given *section* is not known.
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  .. method:: pget(option)
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    Polymorphic getter which returns the *option*'s value (by calling
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    :attr:`LazyConfigOption.getter`) with the appropriate type, defined by
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    :attr:`LazyConfigOption.cls`.
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    :param option: the section.option combination
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    :type option: :obj:`basestring`
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  .. method:: sections()
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    Returns an iterator object for all configuration sections from the
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    :attr:`_cfg` dictionary.
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    :rtype: :obj:`dictionary-keyiterator`
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  .. method:: set(option, value)
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    Like :meth:`ConfigParser.RawConfigParser.set`, but converts the *option*'s
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    new *value* (by calling :attr:`LazyConfigOption.cls`) to the appropriate
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    type/class. When the ``LazyConfigOption``'s optional parameter *validate*
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    was not :const:`None`, the new *value* will be also validated.
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    :param option: the section.option combination
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    :type option: :obj:`basestring`
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    :param value: the new value to be set
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    :type value: :obj:`basestring`
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    :rtype: :const:`None`
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    :raise ConfigValueError: if a boolean value shout be set (:meth:`bool_new`)
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      and it fails
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    :raise ValueError: if an other setter (:attr:`LazyConfigOption.cls`) or
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      validator (:attr:`LazyConfigOption.validate`) fails.
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    :raise VirtualMailManager.errors.VMMError: if
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      :attr:`LazyConfigOption.validate` is set to
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      :func:`VirtualMailManager.exec_ok` or :func:`VirtualMailManager.is_dir`.
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LazyConfigOption
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----------------
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LazyConfigOption instances are required by :class:`LazyConfig` instances, and
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instances of classes derived from `LazyConfig`, like the :class:`Config`
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class.
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.. class:: LazyConfigOption (cls, default, getter[, validate=None])
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  .. versionadded:: 0.6.0
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  The constructor's parameters are:
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  ``cls`` : :obj:`type`
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    The class/type of the option's value.
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  ``default`` : :obj:`str` or the one defined by ``cls``
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    Default value of the option. Use :const:`None` if the option shouldn't
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    have a default value.
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  ``getter``: :obj:`callable`
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    A method's name of :class:`ConfigParser.RawConfigParser` and derived
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    classes, to get a option's value, e.g. `self.getint`.
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  ``validate`` : :obj:`callable` or :const:`None`
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    :const:`None` or any function, which takes one argument and returns the
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    validated argument with the appropriate type (for example:
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    :meth:`LazyConfig.bool_new`). The function should raise a 
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    :exc:`ConfigValueError` if the validation fails. This function checks the
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    new value when :meth:`LazyConfig.set()` is called.
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  Each LazyConfigOption object has the following read-only attributes:
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  .. attribute:: cls
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    The class of the option's value e.g. `str`, `unicode` or `bool`. Used as
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    setter method when :meth:`LazyConfig.set` (or the ``set()`` method of a
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    derived class) is called.
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  .. attribute:: default
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    The option's default value, may be ``None``
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  .. attribute:: getter
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    A method's name of :class:`ConfigParser.RawConfigParser` and derived
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    classes, to get a option's value, e.g. ``self.getint``.
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  .. attribute:: validate
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    A method or function to validate the option's new value.
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Config
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------
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The final configuration class of the virtual mail manager.
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.. class:: Config (filename)
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  Bases: :class:`LazyConfig`
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  :param filename: absolute path to the configuration file.
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  :type filename: :obj:`basestring`
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  .. attribute:: _cfg
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    The configuration ``dict``, containing all configuration sections and
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    options, as described in :attr:`LazyConfig._cfg`.
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  .. method:: check()
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    Checks all section's options for settings w/o a default value.
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    :raise VirtualMailManager.errors.ConfigError: if the check fails
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  .. method:: load()
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    Loads the configuration read-only.
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    :raise VirtualMailManager.errors.ConfigError: if the
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      configuration syntax is invalid
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  .. method:: unicode(section, option)
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    Returns the value of the *option* from *section*, converted to Unicode.
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    This method is intended for the :attr:`LazyConfigOption.getter`.
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    :param section: The name of the configuration section
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    :type section: :obj:`basestring`
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    :param option: The name of the configuration option
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    :type option: :obj:`basestring`
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    :rtype: :obj:`unicode`
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Exceptions
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----------
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.. exception:: BadOptionError(msg)
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  Bases: :exc:`ConfigParser.Error`
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  Raised when a option isn't in the format 'section.option'.
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.. exception:: ConfigValueError(msg)
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  Bases: :exc:`ConfigParser.Error`
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  Raised when creating or validating of new values fails.
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.. exception:: NoDefaultError(section, option)
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  Bases: :exc:`ConfigParser.Error`
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  Raised when the requested option has no default value.