Python: Variable Swapping

Variable Swapping in Python

Variable Swapping in Python: Python makes it really easy to swap values of two or more variables. Example:

>>> x = 10
>>> y = 20
>>> x, y = y, x
>>> y
10
>>> x
20



>>> x = 1
>>> y = 2
>>> z = 3
>>> z, y, x = x, y, z
>>> z
1
>>> y
2
>>> x
3

The way this works is that the expression on the right hand side creates a new tuple. This is one of the ways that tuples can be created. The tuple thus formed gets unpacked into variables on the left hand side.