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html

Contact form with built-in validation

Labels, input types and constraints that browsers validate for free.

<form action="/contact" method="post" novalidate>
  <label for="email">Email</label>
  <input id="email" name="email" type="email" required autocomplete="email">

  <label for="msg">Message</label>

beginner #forms#validation#accessibility

python

Validate data with dataclasses

Use __post_init__ to reject bad values as soon as an object is created.

from dataclasses import dataclass, field


@dataclass
class Product:

intermediate #dataclasses#validation#types

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Contact form with built-in validation

Validate data with dataclasses