filters.py 文件源码

def do_dictsort(value, case_sensitive=False, by='key'):
    """Sort a dict and yield (key, value) pairs. Because python dicts are
    unsorted you may want to use this function to order them by either
    key or value:

    .. sourcecode:: jinja

        {% for item in mydict|dictsort %}
            sort the dict by key, case insensitive

        {% for item in mydict|dictsort(true) %}
            sort the dict by key, case sensitive

        {% for item in mydict|dictsort(false, 'value') %}
            sort the dict by value, case insensitive
    """
    if by == 'key':
        pos = 0
    elif by == 'value':
        pos = 1
    else:
        raise FilterArgumentError('You can only sort by either '
                                  '"key" or "value"')
    def sort_func(item):
        value = item[pos]
        if isinstance(value, string_types) and not case_sensitive:
            value = value.lower()
        return value

    return sorted(value.items(), key=sort_func)