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"""Attribute/instance expiration, deferral of attributes, etc."""
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from test.lib.testing import eq_, assert_raises, assert_raises_message
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from test.lib.util import gc_collect
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from sqlalchemy.testing import eq_, assert_raises, assert_raises_message
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from sqlalchemy.testing.util import gc_collect
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import sqlalchemy as sa
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from test.lib import testing
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from sqlalchemy import testing
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from sqlalchemy import Integer, String, ForeignKey, exc as sa_exc
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from test.lib.schema import Table
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from test.lib.schema import Column
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from sqlalchemy.testing.schema import Table
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from sqlalchemy.testing.schema import Column
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from sqlalchemy.orm import mapper, relationship, create_session, \
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attributes, deferred, exc as orm_exc, defer, undefer,\
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strategies, state, lazyload, backref, Session
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from test.lib import fixtures
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from sqlalchemy.testing import fixtures
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from test.orm import _fixtures