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# Python Dictionary | update method

schedule Aug 10, 2023
Last updated
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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.

`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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