Use of Ordered Dict

user_13903013 0
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I am learning about python collections. It is written about Ordered Dictionary that "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. By contrast, the order the items are inserted is remembered by OrderedDict."

So i tried to understand it by a program:

from collections import OrderedDict 

d = dict()
d['a'] = 1
d['b'] = 2
d['c'] = 3
d['d'] = 4
  
for key, value in d.items(): 
    print(key, value) 
  
print("\nThis is an Ordered Dict:\n") 
od = OrderedDict() 
od['a'] = 1
od['b'] = 2
od['c'] = 3
od['d'] = 4
  
for key, value in od.items(): 
    print(key, value)

OUTPUT

a 1
b 2
c 3
d 4

This is an Ordered Dict:

a 1
b 2
c 3
d 4
>>>

But the output for both is the same. So why should I use Ordered Dictionary?

hash dictionary python
2 Answers

Since python 3.7 Dictionary order is guaranteed to be insertion order. check this answer for similar question link

user_137737960

because-- If the value of a certain key is changed, the position of the key remains unchanged in OrderedDict.

user_125438210
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