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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 delete_file_system(filesystemid,
                       keyid=None,
                       key=None,
                       profile=None,
                       region=None,
                       **kwargs):
    '''
    Deletes a file system, permanently severing access to its contents.
    Upon return, the file system no longer exists and you can't access
    any contents of the deleted file system. You can't delete a file system
    that is in use. That is, if the file system has any mount targets,
    you must first delete them.

    filesystemid
        (string) - ID of the file system to delete.

    CLI Example:

    .. code-block:: bash

        salt 'my-minion' boto_efs.delete_file_system filesystemid
    '''

    client = _get_conn(key=key, keyid=keyid, profile=profile, region=region)

    client.delete_file_system(FileSystemId=filesystemid)