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Python Dictionary | update method

Operations
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Dictionary Operations
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Documentation
schedule Jul 1, 2022
Last updated
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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:

d1 = {'a': 'A', 'b': 'B', 'c': 'c'}
d2 = {'c': 'C'}

d1.update(d2)
print(d1)
{'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:

d1 = {'a': 'A', 'b':'B', 'c':'C'}
d2 = {'d':'D'}

d1.update(d2)
print(d1)
{'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.

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Published by Isshin Inada
Edited by 0 others
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