Transform text to camelCase or CamelCase

        :param text:
        :param first_upper: first symbol must be upper?
        :return:

def _camel_case(cls, text, first_upper=False):
        """
        Transform text to camelCase or CamelCase

        :param text:
        :param first_upper: first symbol must be upper?
        :return:
        """
        result = ''
        need_upper = False
        for pos, symbol in enumerate(text):
            if symbol == '_' and pos > 0:
                need_upper = True
            else:
                if need_upper:
                    result += symbol.upper()
                else:
                    result += symbol.lower()
                need_upper = False
        if first_upper:
            result = result[0].upper() + result[1:]
        return result