Corresponding Dictionary Keys and Values Outputs [duplicate]

Question

As a dictionary is not ordered the output is also not ordered:

>>> d = dict(b = 1, a = 2, z = 3)
>>> d.keys()
['a', 'z', 'b']
>>> d.values()
[2, 3, 1]

But are the keys and values outputs above always in corresponding order?

Answer 1

The answer is yes.

From python 2 documentation:

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(d.values(), d.keys()). The same relationship holds for the iterkeys() and itervalues() methods: pairs = zip(d.itervalues(), d.iterkeys()) provides the same value for pairs. Another way to create the same list is pairs = [(v, k) for (k, v) in d.iteritems()].

And from python 3 documentation

If keys, values and items views are iterated over with no intervening modifications to the dictionary, the order of items will directly correspond