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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def list_passwords(kwargs=None, call=None):
    '''
    List all password on the account

    .. versionadded:: 2015.8.0
    '''
    response = _query('support', 'password/list')

    ret = {}
    for item in response['list']:
        if 'server' in item:
            server = item['server']['name']
            if server not in ret:
                ret[server] = []
            ret[server].append(item)

    return ret