concept
The number of left and right variables must correspond to the number of values
a,b,c=10,20,30
print(a,b,c)
>>>10 20 30
significance
When exchanging two variables in other languages, other variables may be needed,
but in python, it can be done by unpacking and assigning
a,b=10,20
a,b=b,a
print(a,b)
>>>20 10