OrderedDict Python中的交换值和键

Question

Here is my OrderedDict

o=OrderedDict([('xmllist', 123), ('A', 124), ('B', 125), ('C', 126), ('D', 127)])

How can i interchange its keys and values as ,

o=OrderedDict([('A', 123), ('B', 124), ('C', 125), ('D', 126)])

Answer 1

Using zip and itertools.islice :

>>> from collections import OrderedDict
>>> import itertools
>>>
>>> o = OrderedDict([('xmllist', 123), ('A', 124), ('B', 125), ('C', 126), ('D', 127)])
>>> OrderedDict((key1, o[key2]) for key1, key2 in zip(itertools.islice(o, 1, None), o))
OrderedDict([('A', 123), ('B', 124), ('C', 125), ('D', 126)])

mapping: o['A'] = o['xmllist'] , o['B'] = o['A'] , o['C'] = o['B'] , ...