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        some_param = context.config.get_main_option("my option")

    When invoking Alembic programatically, a new
    :class:`.Config` can be created by passing
    the name of an .ini file to the constructor::

        from alembic.config import Config
        alembic_cfg = Config("/path/to/yourapp/alembic.ini")

    With a :class:`.Config` object, you can then
    run Alembic commands programmatically using the directives
    in :mod:`alembic.command`.

    The :class:`.Config` object can also be constructed without
    a filename.   Values can be set programmatically, and
    new sections will be created as needed::

        from alembic.config import Config
        alembic_cfg = Config()
        alembic_cfg.set_main_option("script_location", "myapp:migrations")
        alembic_cfg.set_main_option("sqlalchemy.url", "postgresql://foo/bar")
        alembic_cfg.set_section_option("mysection", "foo", "bar")

    .. warning::

       When using programmatic configuration, make sure the
       ``env.py`` file in use is compatible with the target configuration;
       including that the call to Python ``logging.fileConfig()`` is
       omitted if the programmatic configuration doesn't actually include
       logging directives.

    For passing non-string values to environments, such as connections and
    engines, use the :attr:`.Config.attributes` dictionary::

        with engine.begin() as connection:
            alembic_cfg.attributes['connection'] = connection
            command.upgrade(alembic_cfg, "head")

    :param file\_: name of the .ini file to open.
    :param ini_section: name of the main Alembic section within the
     .ini file
    :param output_buffer: optional file-like input buffer which
     will be passed to the :class:`.MigrationContext` - used to redirect
     the output of "offline generation" when using Alembic programmatically.
    :param stdout: buffer where the "print" output of commands will be sent.
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     ``.config_args``. When the :attr:`.Config.file_config` attribute is
     first invoked, the replacement variable ``here`` will be added to this
     dictionary before the dictionary is passed to ``ConfigParser()``
     to parse the .ini file.

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     which will be populated into the :attr:`.Config.attributes` dictionary.

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