Marcio Rosa da Silva wrote: > In other words, it is safe to do: > > >>> dd = dict(zip(d.values(),d.keys())) > > to exchange keys and values on a dictionary?
See the Library Reference, section 2.3.8 Mapping Types: > Keys and values are listed in an arbitrary order which is non-random, > varies across Python implementations, and depends on the dictionary's > history of insertions and deletions. If items(), keys(), values(), > iteritems(), iterkeys(), and itervalues() are called with no > intervening modifications to the dictionary, the lists will directly > correspond. This allows the creation of (value, key) pairs using > zip(): "pairs = zip(a.values(), a.keys())". The same relationship > holds for the iterkeys() and itervalues() methods: "pairs = > zip(a.itervalues(), a.iterkeys())" provides the same value for pairs. > Another way to create the same list is "pairs = [(v, k) for (k, v) in > a.iteritems()]". -- http://mail.python.org/mailman/listinfo/python-list
