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Cerberus alternative

Project description

Sureberus

This is an implementation of the Cerberus schema format. It doesn't implement all of the features of that library, and where it does implement a feature it doesn't always implement it in the exact same way.

The main reason it exists is to support some of the things that Cerberus doesn't do

normalization inside of *of-rules

The primary important difference is that you can use sureberus if you want to use default or coerce inside of a *of-rule.

Nullable in the face of *of-rules

Sureberus allows you to use nullable even if you have *of-rules that have type constraints. A nullable schema always allows None.

A slightly nicer schema syntax

If you want to construct a schema from Python code instead of storing it as JSON, sureberus provides a more terse syntax for it:

Here's a standard dict-based schema, using an 80-character limit and strict newline/indent-based line wrapping:

myschema = {
    'type': 'dict',
    'anyof': [
        {'schema': {'gradient': {'type': 'string'}}},
        {
            'schema': {
                'image': {'type': 'string'},
                'opacity': {'type': 'integer', 'default': 100},
            }
        },
    ],
}

And here is a sureberus.schema-based schema, using the same line-wrapping rules:

from sureberus.schema import Dict, SubSchema, String, Integer
myschema = Dict(
    anyof=[
        SubSchema(gradient=String()),
        SubSchema(image=String(), opacity=Integer(default=100))
    ]
)

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