摘要： 递归：def oper_two(num_one, oper, num_two): if oper == '+': return str(int(num_one) + int(num_two)) if oper == '-': return str(int(num_one) - int(num_two)) if oper == '*': return str(int(num_one) * int(num_two)) if oper == '/': if num_two != '0': retur... 阅读全文