What is sequence unpacking in Python

What is Sequence Unpacking

We can perform several different assignments simultaneously.

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

The code above generates the following result.

We can use it to switch the contents of two (or more) variables:

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

The code above generates the following result.

Unpack from a tuple.

values = 1, 2, 3 
print values
x, y, z = values 
print x 

The code above generates the following result.

This is particularly useful when a function or method returns a tuple or other sequence or iterable object.

To retrieve and remove an arbitrary key-value pair from a dictionary. You can then use the popitem method, which does just that, returning the pair as a tuple. Then you can unpack the returned tuple directly into two variables:

scoundrel = {'name': 'Robin', 'girlfriend': 'Marion'} 
key, value = scoundrel.popitem() 
print key 
print value 

The code above generates the following result.