OrderedDict in Python

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Concept

An OrderedDict is a dictionary subclass that remembers the order that keys were first inserted.
OrderedDict preserves the order in which the keys are inserted. A regular dict doesn’t track the insertion order and iterating it gives the values in an arbitrary order.



Code

from collections import OrderedDict

od = OrderedDict()
od['1'] = 5
od['2'] = 4
od['3'] = 3
od['4'] = 2
od['5'] = 1



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