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collections | move_to_end method

Standard Library
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collections
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schedule Jul 1, 2022
Last updated
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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.

Return value

None

Examples

Basic usage

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

from collections import OrderedDict
od = 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 OrderedDict
od = 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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Published by Arthur Yanagisawa
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