<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def different_random_nt(self,nt):
 global nts """generate a random nucleotide change. uniform random. will never return itself :param nt: current nucleotide :type nt: char :return: new nucleotide :rtype: char """

    return self._random.choice([x for x in nts if x != nt.upper()])