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flask-wtf
Simple integration of Flask and WTForms, including CSRF, file upload and Recaptcha integration.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
As said in a comment bellow by u/dsaw12, flask-wtf does it all for you. You can read through the source code here. To answer your question, flask-wtf does it for you in this code block. Even if the form was just created there is also code to check if the request give was a POST, PUT, PATCH, or DELETE; after which it then checks if the form was submitted through an _is_submitted() method with in your form class.
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