Funny python 'tricks'

tricks.py

# Turn list of rows into columns

>>> x = [(1,2,3), (4,5,6)]
>>> zip(*x)
[(1, 4), (2, 5), (3, 6)]

# Reverse key-value mapping in a dict

>>> x = {'a': 1, 'b': 2}
>>> dict([reversed(kv) for kv in x.iteritems()])
{1: 'a', 2: 'b'}