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A PRecord is a PMap with a fixed set of specified fields. Records are declared as python classes inheriting
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More documentation and examples of PRecord usage is available at https://github.com/tobgu/pyrsistent
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Set a field in the record. This set function differs slightly from that in the PMap
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Factory method. Will create a new PRecord of the current type and assign the values
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in the set of fields on the PRecord.
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Serialize the current PRecord using custom serializer functions for fields where
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