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50 lines
1.1 KiB
Markdown
50 lines
1.1 KiB
Markdown
# Store And Access Immutable Data In A Tuple
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You can store heterogeneous data (of varying types) as a _tuple_ which is a
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light-weight immutable data structure.
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You can be explicit about the tuple by wrapping the items in parentheses:
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```python
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>>> book = ('An Immense World', 'Ed Yong', 2022)
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```
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Though it is also possible to comma-separate the items and forego the
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parentheses.
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```python
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>>> book2 = 'The Shining', 'Stephen King', 1977
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>>> book2
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('The Shining', 'Stephen King', 1977)
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```
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Once we have our tuple, we can access any item from it positionally. We can
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also use _sequence unpacking_ to assign the values to a series of variables:
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```python
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>>> book[0]
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'An Immense World'
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>>> book[1]
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'Ed Yong'
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>>> book[2]
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2022
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>>> title, author, publication_year = book
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>>> title
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'An Immense World'
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>>> author
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'Ed Yong'
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>>> publication_year
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2022
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```
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And, as promised, it is immutable (unlike lists):
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```python
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>>> book[1] = 'Agatha Christie'
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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TypeError: 'tuple' object does not support item assignment
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```
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[source](https://docs.python.org/3/tutorial/datastructures.html#tuples-and-sequences)
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