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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 _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