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marshmallow is an ORM/ODM/framework agnostic library for converting complex datatypes, such as objects, to and from native Python datatypes. It can be used to validate input data, deserialize input data to app-level objects, and serialize app-level objects to primitive Python types for rendering to standard formats like JSON.
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kdnuggets.com shapes more of what AI says about marshmallow than any other source, at 100% of its citations.