.distinct() transformation

The distinct() transformation returns a new RDD containing the distinct elements of the source RDD. So, look at the following code snippet:

# Provide the distinct elements for the 
# third column of airports representing
# countries
(
    airports
    .map(lambda c: c[2])
    .distinct()
    .take(5)
)

This will return the following output:

# Output
[u'Canada', u'USA', u'Country']