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How to iterate over OrderedDict in Python?

• Difficulty Level : Basic
• Last Updated : 24 Jan, 2021

An OrderedDict is a subclass that preserves the order in which the keys are inserted. The difference between OrderedDict and Dict is that the normal Dict does not keep a track of the way the elements are inserted whereas the OrderedDict remembers the order in which the elements are inserted.

Explanation:

Input : original_dict = { ‘a’:1, ‘b’:2, ‘c’:3, ‘d’:4 }

Output: a 1 b 2 c 3 d 4

Input: original_dict = {‘sayantan’:9, ‘sanjoy’:7, ‘suresh’:5, ‘rony’:2}

Output: sayantan 9 sanjoy 7 suresh 5 rony 2

Steps to perform iteration through Ordereddict in python :

• Import the ordereddict from collection in python.
• Take the input of the ordereddict.
• Iterate through the ordereddict in either of the two approaches given below:

Approach #1

Iterating through the ordereddict and printing the value.

Python3

 `# Python code to implement iteration ` `# over the ordereddict ` ` `  `# import required modules ` `from` `collections ``import` `OrderedDict ` ` `  `# create dictionary ` `od ``=` `OrderedDict({``'a'``: ``1``, ``'b'``: ``2``, ``'c'``: ``3``, ``'d'``: ``4``}) ` ` `  `# iterating over the ordereddict ` `for` `key, value ``in` `od.items(): ` `    ``print``(key, value) `

Output :

```a 1
b 2
c 3
d 4```

The above code can also be written as –

Python3

 `# Python code to implement iteration ` `# over the ordereddict ` ` `  `# import required modules ` `from` `collections ``import` `OrderedDict ` ` `  `# create dictionary ` `od ``=` `OrderedDict({``'a'``: ``1``, ``'b'``: ``2``, ``'c'``: ``3``, ``'d'``: ``4``}) ` ` `  `# iterating over the ordereddict ` `for` `item ``in` `od.items(): ` `    ``print``(``*``item) `

Output :

```a 1
b 2
c 3
d 4```

Approach #2

Iterating through the enumerate objects and printing the value. The enumerate() method is a method in which it adds a counter to the iterable object and returns the value in the form of an enumerate object.

Python3

 `# Python code to implement iteration ` `# over the ordereddict ` ` `  `# import required modules ` `from` `collections ``import` `OrderedDict ` ` `  `# create dictionary ` `od ``=` `OrderedDict({``'a'``: ``1``, ``'b'``: ``2``, ``'c'``: ``3``, ``'d'``: ``4``}) ` ` `  `# iterating through the enumerate objects ` `for` `i, (key, value) ``in` `enumerate``(od.items()): ` `    ``print``(key, value) `

Output:

```a 1
b 2
c 3
d 4```

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