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collections | move_to_end method

schedule Aug 12, 2023
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collections' `move_to_end(~)` method moves an existing key to the beginning or end of an ordered dictionary.

Parameters

1. `key` | `key`

The name of the key to move to the beginning or end of the ordered dictionary.

2. `last` | `boolean` | `optional`

If `True` the key is moved to the end, if `False` the key is moved to the beginning. Defaults to `True`.

`None`

Examples

Basic usage

To move an item to the end of an ordered dictionary:

``` from collections import OrderedDictod = OrderedDict([('key1', 1), ('key2', 2), ('key3', 3)])od.move_to_end('key1', last=True)print(od) OrderedDict([('key2', 2), ('key3', 3), ('key1', 1)]) ```

Notice how `'key1'` and its corresponding value has been moved to the end of the ordered dictionary.

To move an item to the beginning of an ordered dictionary:

``` from collections import OrderedDictod = OrderedDict([('key1', 1), ('key2', 2), ('key3', 3)])od.move_to_end('key3', last=False)print(od) OrderedDict([('key3', 3), ('key1', 1), ('key2', 2)]) ```

Notice how `'key3'` and its corresponding value has been moved to the beginning of the ordered dictionary.

KeyError

If the provided key does not exist, a `KeyError` is raised:

``` od = OrderedDict([('key1', 1), ('key2', 2), ('key3', 3)])od.move_to_end('key4', last=True) KeyError: 'key4' ```
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