Pythonic方式有条件地分配变量

Question

Any suggestions on how to do that in Python?

if x():
  a = 20
  b = 10
else:
  a = 10
  b = 20

I can swap them as below, but it's not as clear (nor very pythonic IMO)

a = 10
b = 20
if x():
  [a, b] = [b, a]

Answer 1

(a,b) = (20,10) if x() else (10,20)

Answer 2

Swapping values with a, b = b, a is considered idiomatic in Python .

a, b = 10, 20
if x(): a, b = b, a

One nice thing is about this is you do not repeat the 10 and 20 , so it is a little DRY-er .