import copy

from datetime import datetime, timedelta

from functools import partial

import time

import six

from warnings import warn

from cassandra.query import SimpleStatement

from cassandra.cqlengine import columns, CQLEngineException, ValidationError, UnicodeMixin

from cassandra.cqlengine import connection as conn

from cassandra.cqlengine.functions import Token, BaseQueryFunction, QueryValue

from cassandra.cqlengine.operators import (InOperator, EqualsOperator, GreaterThanOperator,

GreaterThanOrEqualOperator, LessThanOperator,

LessThanOrEqualOperator, ContainsOperator, BaseWhereOperator)

from cassandra.cqlengine.statements import (WhereClause, SelectStatement, DeleteStatement,

UpdateStatement, InsertStatement,

BaseCQLStatement, MapDeleteClause, ConditionalClause)

from cassandra.cqlengine.concurrent import CQLEngineFuture, CQLEngineFutureWaiter

class QueryException(CQLEngineException):

pass

class IfNotExistsWithCounterColumn(CQLEngineException):

pass

class IfExistsWithCounterColumn(CQLEngineException):

pass

class LWTException(CQLEngineException):

self.existing = existing

class DoesNotExist(QueryException):

pass

class MultipleObjectsReturned(QueryException):

pass

def check_applied(result):

raise LWTException(result[0])

class AbstractQueryableColumn(UnicodeMixin):

return WhereClause(six.text_type(self), LessThanOrEqualOperator(), self._to_database(other))

class BatchType(object):

Unlogged = 'UNLOGGED'

Counter = 'COUNTER'

class BatchQuery(object):

self.execute()

class ContextQuery(object):

return

class AbstractQuerySet(object):