Flask Notes

Sources

• Flask
• How to Structure Large Flask Applications
• How to serve flask applications with uwsgi and nginx

Creating a Flask App Now using Pipenv

• Create directory and cd into directory
• pipenv shell
• Install flask
• pipevn install flask SQLAlchemy psycopg2 click uwsgi

Flask

REST - Serializing and deserialing JSON data

• Using Marshmallow
  • Declaring Schemas
  • Implicit field creation - let marshmallow figure out the field.

    class DemoSchema(Schema):
      class Meta:
        fields=("name", "email", "created_at", "uppername")
    

• Using Marshmallow with jsonschema to validate data from api - No longer recommended. Latest Marsmallow includes actual validation
  • Using marshmallow-jsonschema - marshmallow-jsonschema
    • Use to dump jsonschema from marshmallow
  • Using jsonschema - JsonSchema
    • Uses jsonshema validate, ValidationError
    • Use the jsonschema from marshmallow-jsonschema to validate content from api

          åsch = ReceiptSchema()
          js_schema = json_schema.dump(sch).data
          receipt = request.get_json()
          try:
              validate(receipt, js_schema)
              receipt_data = sch.load(receipt).data
          except ValidationError as err:
              resp['err'] = err.message
      

CORS Configuration - Without using Flask-CORS

---

Last update: April 13, 2020 15:25:03