Python入门——赋值运算符补充

Posted 2021-03-08 夕海_Yumi

• 交叉赋值

a=10
b=20
print(a,b)
a,b=b,a
print(a,b)

• 链式赋值

a=7
b=a
c=b
d=c
print(a,b,c,d)
a=b=c=d=7
print(a,b,c,d)

• 解压赋值（只能取开头或结尾的值）

# salaries=[33,44,55,66,77]
# x=salaries[0]
# y=salaries[1]
# z=salaries[2]
# a=salaries[3]
# b=salaries[4]
# print(x,y,z,a,b)
# 左边变量名的个数与右边包含值的个数相同，多一个不行，少一个不行
# x,y,z,a,b=salaries
# print(x,y,z,a,b)
salaries=[33,44,55,66,77,88,99]
'''
x,y,z,*abc=salaries
x,y,z会对应salaries列表的前三个值
然后*会把剩余的值存放一个列表，然后赋值给abc
print(x,y,z)
print(abc)
'''
# _当变量名，代表该变量值是无用的
# 取前三个值
# x,y,z,*_=salaries
# print(x,y,z)
# print(_)
# 取后两个值
# *_,m,n=salaries
# print(m,n)
x,y,z*_,m,n=salaries
print(x,y,z)
print(m,n)