Convert to snake case.

    :param str text:
    :rtype: str
    :return:

def to_snake_case(text):
    """Convert to snake case.

    :param str text:
    :rtype: str
    :return:
    """
    s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', text)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()