运算符

运算符

算数运算符

1+1

2

1-1

0

1*1

1

2%1

0

5//2

2

比较运算符

1>1

False

1<2

True

1>=1

True

1==1

True

1!=2

True

赋值运算符

x=1
print(x)

1

逻辑运算符

1.and
2.or
3.not

1==1 and 2>1#两个都对

True

1!=1 or 2>1#一个满足就行

True

not not"我是神"

True

身份运算符

is 比较的是id

x=10
y=10
print(x==y)
print(x is y)

True
True

x=257
y=257
print(x==y)
print(x is y)#小整数池不生效

True
False

python运算符的优先级

不背了，想先算的直接加().

链式赋值

x=10
y=10
z=10

x,y,z=10,10,10
print(x,y,z)

10 10 10

交叉赋值

x=10
y=20


z=x
x=y
y=z

print(x,y)

20 10

x=10
y=20
x,y=y,x
print(x,y)

20 10

解压缩

hobby_list=['wan','566',232,777]
print(hobby_list[1])

566

hobby_list=['wan','566',232,777]
print(hobby_list[1])
print(hobby_list[-1])
print(hobby_list[2])

566
777
232

hobby_list=['wan','566',232,777]
_,hobby1,_,hobby2=hobby_list
print(hobby1)
print(hobby2)

566
777

hobby_list=['wan','566',232,777,'wan','566',232,777]
_,hobby1,_,hobby2,*_=hobby_list
print(hobby1)
print(hobby2)

566
777

hobby_list=['wan','566',232,777,'wan','566',232,777]
hobby1,*a,hobby2=hobby_list
print(hobby1)
print(hobby2)
print(a)

wan
777
['566', 232, 777, 'wan', '566', 232]