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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 iso_to_datetime(date):
 """ Convert ISO 8601 time format to datetime format This function converts a date in ISO format, e.g. ``2017-09-14`` to a `datetime` instance, e.g. ``datetime.datetime(2017,9,14,0,0)`` :param date: date in ISO 8601 format :type date: str :return: datetime instance :rtype: datetime """

    chunks = list(map(int, date.split('T')[0].split('-')))
    return datetime.datetime(chunks[0], chunks[1], chunks[2])