33 lines
755 B
Markdown
33 lines
755 B
Markdown
|
---
|
||
|
|
title: Learn About Python Sets
|
||
|
|
---
|
||
|
|
`Set`s in Python are a type of mutable but unordered data structure, which can only contain *unique* elements.
|
||
|
|
|
||
|
|
**Creation:**
|
||
|
|
|
||
|
|
`set` literal:
|
||
|
|
|
||
|
|
Curly brackets, `{}`, *cannot* be used to create an empty set:
|
||
|
|
|
||
|
|
```python
|
||
|
|
>>> not_set = {} # set constructor must be used to make empty sets.
|
||
|
|
>>> type(not_set) # Empty curly brackets create empty dictionaries.
|
||
|
|
<class 'dict'>
|
||
|
|
```
|
||
|
|
|
||
|
|
You can only create an empty set by using the `set()` method.
|
||
|
|
|
||
|
|
```python
|
||
|
|
>>> example_set = set()
|
||
|
|
>>> type(example_set)
|
||
|
|
<class 'set'>
|
||
|
|
```
|
||
|
|
|
||
|
|
However, if elements are included within the curly brackets, then it would be acceptable syntax to create a set.
|
||
|
|
|
||
|
|
```python
|
||
|
|
>>> example_set_2 = {1, 2, 3}
|
||
|
|
>>> type(example_set_2)
|
||
|
|
<class 'set'>
|
||
|
|
````
|