Select value from list of tuples where condition

Question

I have a list of tuples. Every tuple has 5 elements (corresponding to 5 database columns) and I\'d like to make a query

select attribute1 from mylist where a         


        

Answer 1

One solution to this would be a list comprehension, with pattern matching inside your tuple:

>>> mylist = [(25,7),(26,9),(55,10)]
>>> [age for (age,person_id) in mylist if person_id == 10]
[55]

Another way would be using map and filter:

>>> map( lambda (age,_): age, filter( lambda (_,person_id): person_id == 10, mylist) )
[55]