1、算数运算符
print(10 + 3.1)
print(10 + 3)
print(10 / 3) # 结果带小数
print(10 // 3) # 只保留整数部分
print(10 % 3) # 取模、取余数
print(10 ** 3) # 取模、取余数
2、比较运算符: >、>=、<、<=、==、!=
print(10 > 3)
print(10 == 10)
print(10 >= 10)
print(10 >= 3)
name=input('your name: ')
print(name == 'egon')
3、赋值运算符
3.1 =：变量的赋值
3.2 增量赋值：
age = 18
# age += 1 # age=age + 1
# print(age)
age*=3
age/=3
age%=3
age**=3 # age=age**3
3.3 链式赋值
x=10
y=x
z=y
z = y = x = 10 # 链式赋值
print(x, y, z)
print(id(x), id(y), id(z))
3.4 交叉赋值
m=10
n=20
print(m,n)
交换值
temp=m
m=n
n=temp
print(m,n)
m,n=n,m # 交叉赋值
print(m,n)
3.5 解压赋值
salaries=[111,222,333,444,555]
把五个月的工资取出来分别赋值给不同的变量名
mon0=salaries[0]
mon1=salaries[1]
mon2=salaries[2]
mon3=salaries[3]
mon4=salaries[4]
解压赋值
mon0,mon1,mon2,mon3,mon4=salaries
print(mon0)
print(mon1)
print(mon2)
print(mon3)
print(mon4)
mon0,mon1,mon2,mon3=salaries # 对应的变量名少一个不行
mon0,mon1,mon2,mon3,mon4,mon5=salaries # 对应的变量名多一个也不行
引入*，可以帮助我们取两头的值，无法取中间的值
取前三个值
x,y,z,*_=salaries=[111,222,333,444,555] # *会将没有对应关系的值存成列表然后赋值给紧跟其后的那个变量名，此处为_
print(x,y,z)
print(_)
取后三个值
*_,x,y,z=salaries=[111,222,333,444,555]
print(x,y,z)
x,*_,y,z=salaries=[111,222,333,444,555]
print(x,y,z)
salaries=[111,222,333,444,555]
_,*middle,_=salaries
print(middle)
解压字典默认解压出来的是字典的key
x,y,z=dic={'a':1,'b':2,'c':3}
print(x,y,z)