基本运算符
算术运算符
x =10
y =20
print(x+y)
30
print(x-y)
-10
print(x*y)
200
print(x/y)
0.5
print(x%y)#取余
10
print(y//x) #取整
2
print(y**x) #这标识的是20的10次方
10240000000000
比较运算符
a=10
print(a==10)
True
print(a!=10) #!=标识不等于
False
print(a>9)
True
print(a<9)
False
print(a>=9)
True
print(type(a<=9))
<class 'bool'>
赋值运算符
a=300
print(a)
300
a +=100
print(a)
400
a *=10
print(a)
4000
a /=10
print(a)
400.0
a //=10
print(a)
40.0
逻辑运算符
and 、or、not
and：两个都是true才是true，否则为false
print(2>3 and 3>2)
False
print(4>3 and 3>2)
True
or 是两个之中有一个是true，就是true
print(2>3 or 2>1)
True
print(2>3 or 2>4)
False
not 是不是的意思（很少用）
print(not 2>3 or 1>2)
True
身份运算符(了解)
x = 258
y = 258
print(id(x),id(y))
print(id(x)==id(y))
2956579849680 2956579849136
False
print(x is y)
False
链式赋值（周考必考）
x=y=z=10
print(x,y,z)
10 10 10
交叉赋值 (周考必考)
x=10
y=20
x,y = y,x
print(x,y)
20 10
解压缩 （周考必考）
快速且能一次性拿到多个列表里的值
duan_hobby_list = ['read','run']
hobby1 = duan_hobby_list[0]
hobby2 = duan_hobby_list[1]
print(hobby1,hobby2)
read run
hobby1,hobby2 = duan_hobby_list
print(hobby1,hobby2)
read run
duan_hobby_list1 = ['read','run','sing','football','basketball']
hobby1,hobby2,_,_,_= duan_hobby_list1
print(hobby1,hobby2)
read run
hobby1,hobby2,*_ = duan_hobby_list1 # “*”代表后面所有对应赋值的位置
print(hobby1,hobby2)
read run
hobby1,*_,hobby5 = duan_hobby_list1
print(hobby1,hobby5)
read basketball