Python Operators: Arithmetic, Comparison, Assignment, Logical, Membership, Identity, Bitwise, and Operator Precedence

Arithmetic Operators

+   加法运算<br/>-   减法运算<br/>*   乘法运算<br/>/   除法运算<br/>%   模运算<br/>**  幂运算<br/>//  整除运算

Experiment Code

numOne = 10<br/>numTwo = 20<br/><br/>print("numOne + numTwo = %d" %(numOne + numTwo) )<br/>print("numOne - numTwo = %d" %(numOne - numTwo) )<br/>print("numOne * numTwo = %d" %(numOne * numTwo) )<br/>print("numOne / numTwo = %d" %(numOne / numTwo) )<br/>print("numOne % numTwo = {0}".format(numOne % numTwo ) )<br/>print("numOne ** numTwo = %d" %(numOne ** numTwo))<br/>print("numTwo  // numOne = %d" %(numTwo // numOne) )

Comparison Operators

==  等于运算符<br/>!=  不等于<br/>>   大于<br/><   小于<br/>>=  大于等于<br/><=  小于等于<br/><br/>返回值是布尔类型  True False

Experiment Code

#比较运算符<br/>number1 = 123<br/>number2 = 456<br/><br/>print("number1 == number2 is ---> {0}".format(number1 == number2))<br/>print("number1 != number2 is ---> {0}".format(number1 != number2))<br/>print("number1 > number2 is ---> {0}".format(number1 > number2))<br/>print("number1 < number2 is ---> {0}".format(number1 < number2))<br/>print("number1 >= number2 is ---> {0}".format(number1 >= number2))<br/>print("number1 <= number2 is ---> {0}".format(number1 <= number2))

Assignment Operators

=  将右侧的值分配给左侧<br/>+=  先相加然后将结果赋值给左侧<br/>-=  先相减然后将结果赋值给左侧<br/>*=  先相乘然后将结果赋值给左侧<br/>/=  先相除然后将结果赋值给左侧<br/>%=  先求模然后将结果赋值给左侧<br/>**=  先幂运算然后将结果赋值给左侧<br/>//=  先整除然后将结果赋值给左侧

Experiment Code

result = 10<br/><br/>print(result)<br/><br/>num1 = 10<br/>num2 = 20<br/><br/>num1 = num2<br/>print("num1 = num2 ---> {0} ".format(num1))<br/><br/>num1 += num2<br/>print("num1 += num2 ---> {0}".format(num1))<br/><br/>num1 -= num2<br/>print("num1 -= num2 ---> {0}".format(num1))<br/><br/>num1 *= num2<br/>print("num1 *= num2 ---> {0}".format(num1))<br/><br/>num1 /= num2<br/>print("num1 /= num2 ---> {0}".format(num1))<br/><br/>num1 %= num2<br/>print("num1 %= num2 ---> {0}".format(num1))<br/><br/>num1 **= num2<br/>print("num1 **= num2 ---> {0}".format(num1))<br/><br/>num1 //= num2<br/>print("num1 //= num2 ---> {0}".format(num1))

Console Output

10<br/>num1 = num2 ---> 20<br/>num1 += num2 ---> 40<br/>num1 -= num2 ---> 20<br/>num1 *= num2 ---> 400<br/>num1 /= num2 ---> 20.0<br/>num1 %= num2 ---> 0.0<br/>num1 **= num2 ---> 0.0<br/>num1 //= num2 ---> 0.0

Logical Operators

and  逻辑与  两边所有为True 则True 否则 False<br/>or   逻辑或  两边任意为True 则True 否则False<br/>not  逻辑非  如果为True 则为False 变量为False 返回True

Experiment Code

A = True<br/>B = False<br/><br/>print("A and B ---> {0}".format(A and B))<br/>print("A or B ---> {0}".format( A or B))<br/>print("not A ---> {0}".format(not A))<br/>print("not B ---> {0}".format(not B))

Console Output

A and B ---> False<br/>A or B ---> True<br/>not A ---> False<br/>not B ---> True

Membership Operators

in  存在 返回True False<br/>not in  不存在 True False

Experiment Code

# 成员运算符<br/><br/>student = ["zhangsan","lisi","wangwu"]<br/><br/>print("xiaoming is my student ? -->{0}".format("xiaoming" in student))<br/>print("xiaohua is not my student ? -->{0}".format("xiaohua" not in student))<br/>print("zhangsan is my student? -->{0}".format("zhangsan" in student))

Console Output

xiaoming is my student ? -->False<br/>xiaohua is not my student ? -->True<br/>zhangsan is my student? -->True

Identity Operators

is  如果两个对象为同一个内存地址返回True false<br/>is not  不相同返回True  false

Experiment Code

#身份运算符<br/><br/>num1 = 10<br/>num2 = 10<br/><br/>print("num1 is num2 --> {0}".format(num1 is num2))<br/>print("num1 is not num2 --> {0}".format(num1 is not num2))<br/><br/>a = "123"<br/>b = "123"<br/>print("a  is b --> {0}".format(a is b))

Console Output

num1 is num2 --> True<br/>num1 is not num2 --> False<br/>a  is b --> True

Bitwise Operators

&  位于运算<br/>|  位或运算<br/>^  异或运算<br/>~  位取反

Experiment Code

#位运算符<br/>num1 = 1000101<br/>num2 = 10101<br/><br/>print("num1 & num2 = {0}".format(num1&num2))<br/>print("num1 | num2 = {0}".format(num1|num2))<br/>print("num1 ^ num2 = {0}".format(num1^num2))<br/>print("~num1 = {0}".format(~num1))<br/>print("~num2 = {0}".format(~num2))

Console Output

num1 & num2 = 549<br/>num1 | num2 = 1009653<br/>num1 ^ num2 = 1009104<br/>~num1 = -1000102<br/>~num2 = -10102

Operator Precedence

**<br/>~ + -<br/>* / % //<br/>+ -<br/>>> <<<br/>&<br/>^ |<br/><= <> >=<br/>= %= /+= //= -+ += *= **=<br/>is is not<br/>in not in<br/>not or and