変数の中身を入れ替えたりする方法です。

# Swapping values of 2 variables.
x = 100
y = 200

x, y = y, x

print(f"x is {x}, and y is {y}")

# Swapping values of 3 variables.
a = 100
b = 200
c = 300

a, b, c = c, a, b

print(f"a is {a}, b is {b}, and c is {c}")

上記コードの結果はこんな感じです。

>>> 
*** Remote Interpreter Reinitialized ***
x is 200, and y is 100
a is 300, b is 100, and c is 200
>>>