Add Store And Access Immutable Data In A Tuple as a Python TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
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@@ -885,6 +885,7 @@ _1500 TILs and counting..._
 
 - [Access Instance Variables](python/access-instance-variables.md)
 - [Create A Dummy DataFrame In Pandas](python/create-a-dummy-dataframe-in-pandas.md)
+- [Store And Access Immutable Data In A Tuple](python/store-and-access-immutable-data-in-a-tuple.md)
 - [Test A Function With Pytest](python/test-a-function-with-pytest.md)
 - [Use pipx To Install End User Apps](python/use-pipx-to-install-end-user-apps.md)
 

python/store-and-access-immutable-data-in-a-tuple.md

@@ -0,0 +1,49 @@
+# Store And Access Immutable Data In A Tuple
+
+You can store heterogeneous data (of varying types) as a _tuple_ which is a
+light-weight immutable data structure.
+
+You can be explicit about the tuple by wrapping the items in parentheses:
+
+```python
+>>> book = ('An Immense World', 'Ed Yong', 2022)
+```
+
+Though it is also possible to comma-separate the items and forego the
+parentheses.
+
+```python
+>>> book2 = 'The Shining', 'Stephen King', 1977
+>>> book2
+('The Shining', 'Stephen King', 1977)
+```
+
+Once we have our tuple, we can access any item from it positionally. We can
+also use _sequence unpacking_ to assign the values to a series of variables:
+
+```python
+>>> book[0]
+'An Immense World'
+>>> book[1]
+'Ed Yong'
+>>> book[2]
+2022
+>>> title, author, publication_year = book
+>>> title
+'An Immense World'
+>>> author
+'Ed Yong'
+>>> publication_year
+2022
+```
+
+And, as promised, it is immutable (unlike lists):
+
+```python
+>>> book[1] = 'Agatha Christie'
+Traceback (most recent call last):
+  File "<stdin>", line 1, in <module>
+TypeError: 'tuple' object does not support item assignment
+```
+
+[source](https://docs.python.org/3/tutorial/datastructures.html#tuples-and-sequences)