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More documentation and examples of PClass usage is available at https://github.com/tobgu/pyrsistent
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Set a field in the instance. Returns a new instance with the updated value. The original instance remains
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>>> from pyrsistent import PClass, field
>>> class AClass(PClass):
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...
>>> a = AClass(x=1)
>>> a2 = a.set(x=2)
>>> a3 = a.set('x', 3)
>>> a
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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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