website/content/blog/pydataclass.md

---
title: "Quick Python: Dataclasses"
date: 2020-04-08T18:59:48-04:00
draft: false
tags: ["Python"]
---

Python 3.7 and above have a feature called dataclasses. This allows us to reduce boilerplate code by removing the need to create a whole constructor and providing a sensible `__repr__` function.

```python
from dataclasses import dataclass

@dataclass
class Person:
    name: str
    age: int = 0
```

Usage:

```python
p = Person("Bob", 30)
print(p)
```

```
Person(name='Bob', age=20)
```

To make an attribute have a default value, add it after the type declaration like I have with `age`.
New Posts 2020-04-08 23:05:28 +00:00			`---`
			`title: "Quick Python: Dataclasses"`
			`date: 2020-04-08T18:59:48-04:00`
			`draft: false`
Re-tagged blog posts 2022-01-02 19:24:29 +00:00			`tags: ["Python"]`
New Posts 2020-04-08 23:05:28 +00:00			`---`

			Python 3.7 and above have a feature called dataclasses. This allows us to reduce boilerplate code by removing the need to create a whole constructor and providing a sensible `__repr__` function.

			```python
			`from dataclasses import dataclass`

			`@dataclass`
			`class Person:`
			`name: str`
Included optional arguments 2020-05-01 03:18:42 +00:00			`age: int = 0`
New Posts 2020-04-08 23:05:28 +00:00			```

			`Usage:`

			```python
			`p = Person("Bob", 30)`
			`print(p)`
			```

			```
			`Person(name='Bob', age=20)`
			```

Included optional arguments 2020-05-01 03:18:42 +00:00			To make an attribute have a default value, add it after the type declaration like I have with `age`.