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� n�9e� � � � d dl Z dd�Zy)� Nc � � � t � t � r � j dd� j � � � fd�}dj d� � D � � }dj ||rd|z nd |� |� � }|rt |� d dlm} t |d� � } t ||� || S # t $ r }t t |� dz |z � |�d}~ww xY w)a� Produces a class that either can be used standalone or as a base class for persistent classes. This is a thin wrapper around a named tuple. Constructing a type and using it to instantiate objects: >>> Point = immutable('x, y', name='Point') >>> p = Point(1, 2) >>> p2 = p.set(x=3) >>> p Point(x=1, y=2) >>> p2 Point(x=3, y=2) Inheriting from a constructed type. In this case no type name needs to be supplied: >>> class PositivePoint(immutable('x, y')): ... __slots__ = tuple() ... def __new__(cls, x, y): ... if x > 0 and y > 0: ... return super(PositivePoint, cls).__new__(cls, x, y) ... raise Exception('Coordinates must be positive!') ... >>> p = PositivePoint(1, 2) >>> p.set(x=3) PositivePoint(x=3, y=2) >>> p.set(y=-3) Traceback (most recent call last): Exception: Coordinates must be positive! The persistent class also supports the notion of frozen members. The value of a frozen member cannot be updated. For example it could be used to implement an ID that should remain the same over time. A frozen member is denoted by a trailing underscore. >>> Point = immutable('x, y, id_', name='Point') >>> p = Point(1, 2, id_=17) >>> p.set(x=3) Point(x=3, y=2, id_=17) >>> p.set(id_=18) Traceback (most recent call last): AttributeError: Cannot set frozen members id_ �,� c � �� �D � cg c] } | j d� s�d| z �� }} |r!dj dj |� �� S yc c} w )N�_�'%s'z� frozen_fields = fields_to_modify & set([{frozen_members}]) if frozen_fields: raise AttributeError('Cannot set frozen members %s' % ', '.join(frozen_fields)) �, )�frozen_members� )�endswith�format�join)�fr �memberss ��7/usr/lib/python3/dist-packages/pyrsistent/_immutable.py�frozen_member_testz%immutable.<locals>.frozen_member_test4 sT �� �.5�I�����C��&�1�*�I��I��� ��d�i�i��&?��@� A� �� Js �A �A r c 3 �&