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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 describe_db_subnet_groups(name=None, filters=None, jmespath='DBSubnetGroups',
                              region=None, key=None, keyid=None, profile=None):
    '''
    Return a detailed listing of some, or all, DB Subnet Groups visible in the
    current scope.  Arbitrary subelements or subsections of the returned dataset
    can be selected by passing in a valid JMSEPath filter as well.

    CLI example::

        salt myminion boto_rds.describe_db_subnet_groups

    '''
    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
    pag = conn.get_paginator('describe_db_subnet_groups')
    args = {}
    args.update({'DBSubnetGroupName': name}) if name else None
    args.update({'Filters': filters}) if filters else None
    pit = pag.paginate(**args)
    pit = pit.search(jmespath) if jmespath else pit
    return [p for p in pit]