Method I
--------
c = [(1, 'NURSERY'), (2, 'LKG'), (3, 'UKG'), (4, '1')]
key=3

>>> for i, j in c:
... if i==key: print j

UKG

Method II
---------
c = [(1, 'NURSERY'), (2, 'LKG'), (3, 'UKG'), (4, '1')] 
r = dict((x[0],x[1]) for x in c)

print r[3]

UKG

Method III
----------
Anything better than the above two?

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