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Python Dictionary | setdefault method

Operations
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Dictionary Operations
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Documentation
schedule Jul 1, 2022
Last updated
local_offer Python
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Python's dict.setdefault(~) method returns the value for the specified key in a dictionary.

If the key does not exist, it will insert the key into the dictionary with the default value.

Parameters

1. key | any

The key to be searched in the dictionary.

2. default | any | optional

The default value to be inserted if the key does not exist in the dictionary. Defaults to None.

Return value

Case

Return value

If the key exists in dictionary

Value of the key

If the key does NOT exist in dictionary

default value

Examples

Basic usage

To return the value for key 'Nissan' in cars dictionary:

cars = {'Toyota': 'Green', 'Nissan': 'Yellow', 'Honda': 'Blue'}
cars.setdefault('Nissan')
'Yellow'

To return the value for key 'Renault' in cars dictionary:

cars = {'Toyota': 'Green', 'Nissan':'Yellow', 'Honda':'Blue'}
print(cars.setdefault('Renault'))
print("cars =", cars)
None
cars = {'Toyota': 'Green', 'Nissan': 'Yellow', 'Honda': 'Blue', 'Renault': None}

As 'Renault' was not a key in cars and we did not provide a default argument we return None. Note that we can also see the key/value pair of 'Renault': None has been added to cars dictionary.

Default parameter

To return the value for key 'Renault' in cars dictionary:

cars = {'Toyota': 'Green', 'Nissan':'Yellow', 'Honda':'Blue'}
cars.setdefault('Renault', 'Orange')
print("cars =", cars)
cars = {'Toyota': 'Green', 'Nissan': 'Yellow', 'Honda': 'Blue', 'Renault': 'Orange'}

As 'Renault' was not a key in cars and we provided 'Orange' as default argument, the key/value pair of 'Renault': 'Orange' has been added to cars dictionary.

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Published by Isshin Inada
Edited by 0 others
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