# dict() constructor builds dictionaries directly from lists of key-value pairs stored
# as tuples.
print dict([('sape', 4139), ('guido', 4127), ('jack', 4098)])
print dict([(x, x**2) for x in (2, 4, 6)]) # use a list comprehension
# When the keys are simple strings, it is sometimes easier to specify pairs using
# keyword arguments:
print dict(sape=4139, guido=4127, jack=4098)