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            def __init__(self, directory):
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            def load_bytecode(self, bucket):
                filename = path.join(self.directory, bucket.key)
                if path.exists(filename):
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    The pattern can be used to have multiple separate caches operate on the
    same directory.  The default pattern is ``'__jinja2_%s.cache'``.  ``%s``
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    Libraries compatible with this class:

    -   `cachelib <https://github.com/pallets/cachelib>`_
    -   `python-memcached <https://pypi.org/project/python-memcached/>`_

    (Unfortunately the django cache interface is not compatible because it
    does not support storing binary data, only unicode.  You can however pass
    the underlying cache client to the bytecode cache which is available
    as `django.core.cache.cache._client`.)

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        .. method:: set(key, value[, timeout])

            Stores the bytecode in the cache.  `value` is a string and
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            a default timeout or no timeout should be assumed, if it's
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        .. method:: get(key)

            Returns the value for the cache key.  If the item does not
            exist in the cache the return value must be `None`.

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