Added links to file docs.

.. class:: File(file_object)

    The :class:`File` is a thin wrapper around Python's built-in file object

    with some Django-specific additions. Internally, Django uses this class

    any time it needs to represent a file.

    The :class:`File` class is a thin wrapper around Python's :py:ref:`built-in

    file object<bltin-file-objects>` with some Django-specific additions.

    Internally, Django uses this class when it needs to represent a file.

    :class:`File` objects have the following attributes and methods:

    .. attribute:: name

        The name of file including the relative path from

        The name of the file including the relative path from

        :setting:`MEDIA_ROOT`.

    .. attribute:: size

    .. attribute:: file

        The underlying Python ``file`` object passed to

        :class:`~django.core.files.File`.

        The underlying :py:ref:`built-in file object<bltin-file-objects>` that

        this class wraps.

    .. attribute:: mode

    .. method:: open([mode=None])

        Open or reopen the file (which by definition also does

        ``File.seek(0)``). The ``mode`` argument allows the same values

        as Python's standard ``open()``.

        Open or reopen the file (which also does ``File.seek(0)``).

        The ``mode`` argument allows the same values

        as Python's built-in :func:`python:open()`.

        When reopening a file, ``mode`` will override whatever mode the file

        was originally opened with; ``None`` means to reopen with the original

        Writes the specified content string to the file. Depending on the

        storage system behind the scenes, this content might not be fully

        committed until ``close()`` is called on the file.

        committed until :func:`close()` is called on the file.

    .. method:: close()

        Close the file.

    In addition to the listed methods, :class:`~django.core.files.File` exposes

    the following attributes and methods of the underlying ``file`` object:

    the following attributes and methods of its ``file`` object:

    ``encoding``, ``fileno``, ``flush``, ``isatty``, ``newlines``,

    ``read``, ``readinto``, ``readlines``, ``seek``, ``softspace``, ``tell``,

    ``truncate``, ``writelines``, ``xreadlines``.

Additional methods on files attached to objects

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

Any :class:`File` that's associated with an object (as with ``Car.photo``,

Any :class:`File` that is associated with an object (as with ``Car.photo``,

below) will also have a couple of extra methods:

.. method:: File.save(name, content, [save=True])

        >>> car.photo.save('myphoto.jpg', content, save=False)

        >>> car.save()

    are the same as this one line::

    are equivalent to::

        >>> car.photo.save('myphoto.jpg', content, save=True)