Python3中运算符 **和*的区别

最新推荐文章于 2024-07-06 15:08:00 发布

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本文探讨了Python中大数运算的特点，包括整数和浮点数的不同表现。通过实例演示了整数在Python3中几乎不会因大小而溢出，其运算能力受限于内存。同时，揭示了浮点数运算可能遇到的溢出问题，并对比了不同运算符的影响。

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我们知道**代表次方。

如下

>>>12 * 12
144
>>>12 ** 2
144


>>>a=1e200
>>> a
1e+200
>>>a ** 2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OverflowError: (34, 'Result too large')
>>>a * a
inf
>>>a = 100 ** 100  # python3中int整型一般不会溢出，取决于内存
100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
>>>a * a,a ** 2   # 两种方式都没问题，int很大，不会溢出，取决于内存
(10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000)
>>>float(a) * float(a)    #float用这种方法，也不会溢出
inf
>>>float(a) ** 2  #float用这种方式有可能溢出，注意！！！
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OverflowError: (34, 'Result too large')