Pythonic Swap?

Question

I found that i have to perform a swap in python and i write something like this.

arr[first], arr[second] = arr[second], arr[first]

I suppos

Answer 1

a, b = b, a is about as short as you'll get, it's only three characters (aside from the variable names).. It's about as Python'y as you'll get

One alternative is the usual use-a-temp-variable:

self.memberlist[someindexA], self.memberlist[someindexB] = self.memberlist[someindexB], self.memberlist[someindexA]

..becomes..

temp = self.memberlist[someindexB]
self.memberlist[someindexB] = self.memberlist[someindexA]
self.memberlist[someindexA] = temp

..which I think is messier and less "obvious"

Another way, which is maybe a bit more readable with long variable names:

a, b = self.memberlist[someindexA], self.memberlist[someindexB]
self.memberlist[someindexA], self.memberlist[someindexB] = b, a