author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 307 | c6bca38c1cbf |
permissions | -rw-r--r-- |
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The ``File`` object |
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=================== |
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The :mod:`django.core.files` module and its submodules contain built-in classes |
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for basic file handling in Django. |
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.. currentmodule:: django.core.files |
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The ``File`` Class |
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------------------ |
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.. class:: File(file_object) |
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The :class:`File` is a thin wrapper around Python's built-in file object |
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with some Django-specific additions. Internally, Django uses this class |
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any time it needs to represent a file. |
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:class:`File` objects have the following attributes and methods: |
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.. attribute:: name |
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The name of file including the relative path from |
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:setting:`MEDIA_ROOT`. |
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.. attribute:: size |
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The size of the file in bytes. |
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.. attribute:: file |
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The underlying Python ``file`` object passed to |
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:class:`~django.core.files.File`. |
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.. attribute:: mode |
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The read/write mode for the file. |
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.. method:: open([mode=None]) |
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Open or reopen the file (which by definition also does |
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``File.seek(0)``). The ``mode`` argument allows the same values |
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as Python's standard ``open()``. |
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When reopening a file, ``mode`` will override whatever mode the file |
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was originally opened with; ``None`` means to reopen with the original |
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mode. |
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.. method:: read([num_bytes=None]) |
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Read content from the file. The optional ``size`` is the number of |
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bytes to read; if not specified, the file will be read to the end. |
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.. method:: __iter__() |
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Iterate over the file yielding one line at a time. |
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.. method:: chunks([chunk_size=None]) |
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Iterate over the file yielding "chunks" of a given size. ``chunk_size`` |
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defaults to 64 KB. |
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This is especially useful with very large files since it allows them to |
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be streamed off disk and avoids storing the whole file in memory. |
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.. method:: multiple_chunks([chunk_size=None]) |
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Returns ``True`` if the file is large enough to require multiple chunks |
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to access all of its content give some ``chunk_size``. |
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.. method:: write([content]) |
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Writes the specified content string to the file. Depending on the |
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storage system behind the scenes, this content might not be fully |
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committed until ``close()`` is called on the file. |
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.. method:: close() |
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Close the file. |
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In addition to the listed methods, :class:`~django.core.files.File` exposes |
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the following attributes and methods of the underlying ``file`` object: |
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``encoding``, ``fileno``, ``flush``, ``isatty``, ``newlines``, |
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``read``, ``readinto``, ``readlines``, ``seek``, ``softspace``, ``tell``, |
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``truncate``, ``writelines``, ``xreadlines``. |
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.. currentmodule:: django.core.files.base |
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The ``ContentFile`` Class |
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------------------------- |
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.. class:: ContentFile(File) |
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The ``ContentFile`` class inherits from :class:`~django.core.files.File`, |
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but unlike :class:`~django.core.files.File` it operates on string content, |
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rather than an actual file. For example:: |
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from django.core.files.base import ContentFile |
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f1 = ContentFile("my string content") |
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f2 = ContentFile(u"my unicode content encoded as UTF-8".encode('UTF-8')) |
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.. currentmodule:: django.core.files.images |
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The ``ImageFile`` Class |
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----------------------- |
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.. class:: ImageFile(file_object) |
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Django provides a built-in class specifically for images. |
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:class:`django.core.files.images.ImageFile` inherits all the attributes |
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and methods of :class:`~django.core.files.File`, and additionally |
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provides the following: |
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.. attribute:: width |
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Width of the image in pixels. |
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.. attribute:: height |
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Height of the image in pixels. |
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.. currentmodule:: django.core.files |
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Additional methods on files attached to objects |
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----------------------------------------------- |
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Any :class:`File` that's associated with an object (as with ``Car.photo``, |
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below) will also have a couple of extra methods: |
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.. method:: File.save(name, content, [save=True]) |
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Saves a new file with the file name and contents provided. This will not |
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replace the existing file, but will create a new file and update the object |
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to point to it. If ``save`` is ``True``, the model's ``save()`` method will |
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be called once the file is saved. That is, these two lines:: |
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>>> car.photo.save('myphoto.jpg', contents, save=False) |
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>>> car.save() |
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are the same as this one line:: |
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>>> car.photo.save('myphoto.jpg', contents, save=True) |
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Note that the ``content`` argument must be an instance of either |
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:class:`File` or of a subclass of :class:`File`, such as |
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:class:`ContentFile`. |
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.. method:: File.delete([save=True]) |
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Removes the file from the model instance and deletes the underlying file. |
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If ``save`` is ``True``, the model's ``save()`` method will be called once |
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the file is deleted. |