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�Z<dS )7z�A sandbox layer that ensures unsafe operations cannot be performed.
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�r�|tv r�dS n"t td�r�t | tj�r�|tv r�dS |�d�S )a� Test if the attribute given is an internal python attribute. For
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>>> from jinja2.sandbox import is_internal_attribute
>>> is_internal_attribute(str, "mro")
True
>>> is_internal_attribute(str, "upper")
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`MutableMapping`, and `MutableSequence`.
>>> modifies_known_mutable({}, "clear")
True
>>> modifies_known_mutable({}, "keys")
False
>>> modifies_known_mutable([], "append")
True
>>> modifies_known_mutable([], "index")
False
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.. versionadded:: 2.6
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.. versionadded:: 2.6
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.. versionadded:: 2.6
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