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    jinja2.environment
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    Provides a class that holds runtime and parsing time options.

    :copyright: (c) 2010 by the Jinja Team.
    :license: BSD, see LICENSE for more details.
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    will lead to surprising effects and undefined behavior.

    Here are the possible initialization parameters:

        `block_start_string`
            The string marking the beginning of a block.  Defaults to ``'{%'``.

        `block_end_string`
            The string marking the end of a block.  Defaults to ``'%}'``.

        `variable_start_string`
            The string marking the beginning of a print statement.
            Defaults to ``'{{'``.

        `variable_end_string`
            The string marking the end of a print statement.  Defaults to
            ``'}}'``.

        `comment_start_string`
            The string marking the beginning of a comment.  Defaults to ``'{#'``.

        `comment_end_string`
            The string marking the end of a comment.  Defaults to ``'#}'``.

        `line_statement_prefix`
            If given and a string, this will be used as prefix for line based
            statements.  See also :ref:`line-statements`.

        `line_comment_prefix`
            If given and a string, this will be used as prefix for line based
            comments.  See also :ref:`line-statements`.

            .. versionadded:: 2.2

        `trim_blocks`
            If this is set to ``True`` the first newline after a block is
            removed (block, not variable tag!).  Defaults to `False`.

        `lstrip_blocks`
            If this is set to ``True`` leading spaces and tabs are stripped
            from the start of a line to a block.  Defaults to `False`.

        `newline_sequence`
            The sequence that starts a newline.  Must be one of ``'\r'``,
            ``'\n'`` or ``'\r\n'``.  The default is ``'\n'`` which is a
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            applications.

        `keep_trailing_newline`
            Preserve the trailing newline when rendering templates.
            The default is ``False``, which causes a single newline,
            if present, to be stripped from the end of the template.

            .. versionadded:: 2.7

        `extensions`
            List of Jinja extensions to use.  This can either be import paths
            as strings or extension classes.  For more information have a
            look at :ref:`the extensions documentation <jinja-extensions>`.

        `optimized`
            should the optimizer be enabled?  Default is `True`.

        `undefined`
            :class:`Undefined` or a subclass of it that is used to represent
            undefined values in the template.

        `finalize`
            A callable that can be used to process the result of a variable
            expression before it is output.  For example one can convert
            `None` implicitly into an empty string here.

        `autoescape`
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            default.  For more details about autoescaping see
            :class:`~jinja2.utils.Markup`.  As of Jinja 2.4 this can also
            be a callable that is passed the template name and has to
            return `True` or `False` depending on autoescape should be
            enabled by default.

            .. versionchanged:: 2.4
               `autoescape` can now be a function

        `loader`
            The template loader for this environment.

        `cache_size`
            The size of the cache.  Per default this is ``400`` which means
            that if more than 400 templates are loaded the loader will clean
            out the least recently used template.  If the cache size is set to
            ``0`` templates are recompiled all the time, if the cache size is
            ``-1`` the cache will not be cleaned.

            .. versionchanged:: 2.8
               The cache size was increased to 400 from a low 50.

        `auto_reload`
            Some loaders load templates from locations where the template
            sources may change (ie: file system or database).  If
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            requested the loader checks if the source changed and if yes, it
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            disable that.

        `bytecode_cache`
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            See :ref:`bytecode-cache` for more information.
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