human
Solve the following python programming problem given the following code:
@environmentfilter
def do_sort(environment, value, reverse=False, case_sensitive=False, attribute=None):
assistant
#Here is the Python code you requested.

    """Sort an iterable.  Per default it sorts ascending, if you pass it
    true as first argument it will reverse the sorting.
    If the iterable is made of strings the third parameter can be used to
    control the case sensitiveness of the comparison which is disabled by
    default.
    .. sourcecode:: jinja
    {% for item in iterable|sort %}
    {% endfor %}
    It is also possible to sort by an attribute (for example to sort
    by the date of an object) by specifying the `attribute` parameter:
    .. sourcecode:: jinja
    {% for item in iterable|sort(attribute=\date\) %}
    {% endfor %}
    .. versionchanged:: 2.6
    The `attribute` parameter was added.
    """
    if (not case_sensitive):
        def sort_func(item):
            if isinstance(item, string_types):
                item = item.lower()
            return item
    else:
        sort_func = None
    if (attribute is not None):
        getter = make_attrgetter(environment, attribute)
        def sort_func(item, processor=(sort_func or (lambda x: x))):
            return processor(getter(item))
    return sorted(value, key=sort_func, reverse=reverse)