Python中比较特别的除法运算和幂运算介绍
不管是啥语言都离不开加减乘除这些算法,但是在Python里面你知道这些符号代表什么运算吗?
“/”这个是除法运算,那么这个“//”呢?“*”这个是乘法运算,那么这个“**”呢?下面来一一介绍下。
“//”运算
除法运算符是“/”,这个人人皆知道,但是这个二元运算符“/”求出来的结果都是取决于操作数本身的,比如:
20 / 3
6
20 / 3.0
6.666666666666667
20.0 / 3
6.666666666666667
20.0 / 3.0
6.666666666666667
也就是说,使用“/”运算符时,只要有一个操作数是浮点数,那么产生的结果就是浮点数结果,我们称之为真除,但是要是两个操作数都是整型数的话,那么产生的结果就是一个舍小数位的整型数,这个我们称之为整除。但是如果有这一种情况,无论操作数是整型数、浮点数神马的,我要的结果都是整除,那么“//”就派上用场了,这个“//”就是来解决这个问题的。
“//”是从Python2.2开始,除法运算符除了“/”之外,又引入了一个除法运算符,这一种运算符只用于进行整除法,示例如下:
20 // 3
6
20 // 3.0
6.0
20.0 // 3
6.0
20.0 // 3.0
6.0
20 // 3.00
6.0
无论操作数如何,”//”的结果都是整除,如果操作数是浮点数的话,返回给我们的是一个整除结果转换成浮点数而已。
“**”运算
这个“**”比较简单,就是标题中的Python的幂运算了,演示如下:
2 ** 0
1
2 ** 1
2
2 ** 10
1024
2 ** 20
1048576
第一操作数为底数,第二个操作数则为指数。
完~

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