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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 _parsed_version(user=None, host=None, port=None, maintenance_db=None,
                    password=None, runas=None):
    '''
    Returns the server version properly parsed and int casted for internal use.

    If the Postgres server does not respond, None will be returned.
    '''

    psql_version = version(
        user,
        host=host,
        port=port,
        maintenance_db=maintenance_db,
        password=password,
        runas=runas,
    )

    if psql_version:
        return _LooseVersion(psql_version)
    else:
        log.warning('Attempt to parse version of Postgres server failed. '
                    'Is the server responding?')
        return None