assign.py

#链式赋值
m=n=[1,2,3]
m[0]=2
print(m,n) #m,n都改变了

x=y='xxx'
y='yyy'
print(x,y)  #只有y 改变


#序列解包
x,y,z=1,2,3
print(x,y,z)
try:
    x,y,z=1,2   #error
    x,y,z=1,2,3,4   #error
except Exception as e:
    print(e)