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Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>
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# Sequence Types: list
{:.no_toc}
<nav markdown="1" class="toc-class">
* TOC
{:toc}
</nav>
## The goal
> Lists are **mutable** sequences, **typically** used to store collections of **homogeneous** items (where the precise degree of similarity will vary by application).​
[Quote](https://docs.python.org/3/library/stdtypes.html#lists)
Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
## Example Lists
With homogeneous items:
```python
primes = [2, 3, 5, 7]
collection_of_strings = [
"AA",
"BB",
"CC",
"DD",
"EE",
"FF",
"GG",
"HH",
]
```
A mixture of type:
```python
def my_function(a):
return a
my_favourite_things = [32, "sleep", my_function]
```
## Indexing
```python
collection_of_strings = [
"AA",
"BB",
"CC",
"DD",
"EE",
"FF",
"GG",
"HH",
]
print(collection_of_strings[0]) # -> AA
print(collection_of_strings[1]) # -> BB
print(collection_of_strings[-2]) # -> GG
print(collection_of_strings[-1]) # -> HH
```
## Slicing
```python
collection_of_strings = [
"AA",
"BB",
"CC",
"DD",
"EE",
"FF",
"GG",
"HH",
]
print(collection_of_strings[0:3]) # -> ['AA', 'BB', 'CC']
print(collection_of_strings[:3]) # -> ['AA', 'BB', 'CC']
print(collection_of_strings[3:]) # -> ['DD', 'EE', 'FF', 'GG', 'HH']
print(collection_of_strings[1:-1]) # -> ['BB', 'CC', 'DD', 'EE', 'FF', 'GG']
print(collection_of_strings[-3:]) # -> ['FF', 'GG', 'HH']
```
## Changing lists
```python
collection_of_strings = [
"AA",
"BB",
"CC",
"DD",
"EE",
"FF",
"GG",
"HH",
]
collection_of_strings[3] = "II"
print(collection_of_strings) # -> ['AA', 'BB', 'CC', 'II', 'EE', 'FF', 'GG', 'HH']
collection_of_strings[:3] = ["JJ", "KK", "LL"]
print(collection_of_strings) # -> ['JJ', 'KK', 'LL', 'II', 'EE', 'FF', 'GG', 'HH']
collection_of_strings[:4] = [
"MM",
"NN",
"OO",
"PP",
]
print(collection_of_strings) # -> ['MM', 'NN', 'OO', 'PP', 'EE', 'FF', 'GG', 'HH']
```
## List functions
# [len()](https://docs.python.org/3/library/functions.html#len) and [sorted()](https://docs.python.org/3/library/functions.html#sorted)
```python
collection_of_strings = [
"GG",
"HH",
"AA",
"BB",
"EE",
"FF",
"CC",
"DD",
]
print(len(collection_of_strings)) # -> 8
print(sorted(collection_of_strings)) # -> ['AA', 'BB', 'CC', 'DD', 'EE', 'FF', 'GG', 'HH']
```
### [max()](https://docs.python.org/3/library/functions.html#max) and [sum()](https://docs.python.org/3/library/functions.html#sum)
```python
primes = [2, 3, 5, 7]
print(sum(primes)) # -> 17
print(max(primes)) # -> 7
```