.filter(...) transformation

The filter(f)  transformation returns a new RDD based on selecting elements for which the f function returns true. Therefore, look at the following code snippet:

# User filter() to filter where second column == "WA"
(
    airports
    .map(lambda c: (c[0], c[1]))
    .filter(lambda c: c[1] == "WA")
    .take(5)
)

This will produce the following output:

# Output
[(u'Bellingham', u'WA'),
 (u'Moses Lake', u'WA'),  
 (u'Pasco', u'WA'),  
 (u'Pullman', u'WA'),  
 (u'Seattle', u'WA')]