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A PClass is a python class with a fixed set of specified fields. PClasses are declared as python classes inheriting
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is not a PMap and hence not a collection but rather a plain Python object.
More documentation and examples of PClass usage is available at https://github.com/tobgu/pyrsistent
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Returns an evolver for this object.
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Remove attribute given by name from the current instance. Raises AttributeError if the
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