Flask·Flask essentials

Forms and validation

Forms post data that must be validated on the server.

Beginner 10 min read Lesson 4 of 150 Challenge included
What you will be able to do
  • Read request.form.
  • Reject invalid input.
  • Show errors next to fields.

In plain English

Forms post data that must be validated on the server.

  • Read request.form.
  • Reject invalid input.
  • Show errors next to fields.
forms.pyPython
email = request.form.get('email', '').strip()
if '@' not in email:
    return 'Invalid email', 422
Your turn

Explain it back

Easy

Answer from memory: Which status code fits validation failure?

TEXT · starter
Your answer…
Check your understanding before moving on.
Knowledge checkQuestion 1

Which status code fits validation failure?

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