位置参数
定义位置参数函数
def power(x, n): #函数有两个参数：x和n，这两个参数都是位置参数，调用函数时，传入的两个值按照位置顺序依次赋给参数x和n s = 1 while n > 0: n = n - 1 s = s * x return s
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