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Python Dictionary | update method
schedule Aug 10, 2023
Last updated local_offer
Tags Python
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Python's dict.update(~) method updates the dictionary with the elements from another iterable of key/value pairs.
Parameters
1. other | iterable | optional
The iterable containing key/value pairs to update dictionary with.
Return value
None
Examples
Basic usage
To update dictionary d1 with values of dictionary d2:
{'a': 'A', 'b': 'B', 'c': 'C'}
As the key 'c' already existed in dictionary d1, its value was overwritten with the value 'C' from d2.
When the key does not already exist in dictionary, the new key/value pair is added:
{'a': 'A', 'b': 'B', 'c': 'C', 'd': 'D'}
Note that we can see the key/value pair of 'd': 'D' has been added to d1 dictionary.
Related
Merging two dictionaries in Python
There are 2 main ways to merge two dictionaries: using a shallow merge or using the dict.update(~) method.
Adding new key-value pairs to a dictionary in Python
There are 2 main ways to add new keys to a dictionary: subscript notation or dict.update(~) method.
Published by Isshin Inada
Edited by 0 others
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Official Python Documentation
https://docs.python.org/3/library/stdtypes.html#dict.update
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