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File: //snap/core20/2599/lib/python3/dist-packages/jinja2/__pycache__/bccache.cpython-38.pyc
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    jinja2.bccache
    ~~~~~~~~~~~~~~

    This module implements the bytecode cache system Jinja is optionally
    using.  This is useful if you have very complex template situations and
    the compiliation of all those templates slow down your application too
    much.

    Situations where this is useful are often forking web applications that
    are initialized on the first request.

    :copyright: (c) 2017 by the Jinja Team.
    :license: BSD.
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        from os import path

        class MyCache(BytecodeCache):

            def __init__(self, directory):
                self.directory = directory

            def load_bytecode(self, bucket):
                filename = path.join(self.directory, bucket.key)
                if path.exists(filename):
                    with open(filename, 'rb') as f:
                        bucket.load_bytecode(f)

            def dump_bytecode(self, bucket):
                filename = path.join(self.directory, bucket.key)
                with open(filename, 'wb') as f:
                    bucket.write_bytecode(f)

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    Jinja2.
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    Windows the user's temp directory is used, on UNIX systems a directory
    is created for the user in the system temp directory.

    The pattern can be used to have multiple separate caches operate on the
    same directory.  The default pattern is ``'__jinja2_%s.cache'``.  ``%s``
    is replaced with the cache key.

    >>> bcc = FileSystemBytecodeCache('/tmp/jinja_cache', '%s.cache')

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�ZdS)�MemcachedBytecodeCacheavThis class implements a bytecode cache that uses a memcache cache for
    storing the information.  It does not enforce a specific memcache library
    (tummy's memcache or cmemcache) but will accept any class that provides
    the minimal interface required.

    Libraries compatible with this class:

    -   `werkzeug <http://werkzeug.pocoo.org/>`_.contrib.cache
    -   `python-memcached <https://www.tummy.com/Community/software/python-memcached/>`_
    -   `cmemcache <http://gijsbert.org/cmemcache/>`_

    (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`.)

    The minimal interface for the client passed to the constructor is this:

    .. class:: MinimalClientInterface

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

            Stores the bytecode in the cache.  `value` is a string and
            `timeout` the timeout of the key.  If timeout is not provided
            a default timeout or no timeout should be assumed, if it's
            provided it's an integer with the number of seconds the cache
            item should exist.

        .. 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`.

    The other arguments to the constructor are the prefix for all keys that
    is added before the actual cache key and the timeout for the bytecode in
    the cache system.  We recommend a high (or no) timeout.

    This bytecode cache does not support clearing of used items in the cache.
    The clear method is a no-operation function.

    .. versionadded:: 2.7
       Added support for ignoring memcache errors through the
       `ignore_memcache_errors` parameter.
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