cykooz.sequence 1.0.2

序列

>>> import persistent
>>> import zope.annotation.interfaces
>>> from zope.interface import implements

我们需要一个测试对象，其中SequenceGenerator存储其数据

>>> class Dummy(persistent.Persistent):
...     implements(zope.annotation.interfaces.IAttributeAnnotatable)

>>> test_object = Dummy()

通过适配ISequenceGenerator，您可以获取SequenceGenerator

>>> from cykooz.sequence.interfaces import ISequenceGenerator
>>> seq_gen = ISequenceGenerator(test_object)

您将获得这样的序列

>>> seq_gen.getNextValue()
1
>>> seq_gen.getNextValue()
2
>>> seq_gen.getNextValue()
3

您还可以将生成器设置为某个值

>>> seq_gen.setNextValue(1)
>>> seq_gen.getNextValue()
1

>>> seq_gen.setNextValue(5)
>>> seq_gen.getNextValue()
5
>>> seq_gen.getNextValue()
6
>>> seq_gen.getNextValue()
7
>>> seq_gen.getNextValue()
8

但setNextValue只接受整数参数

>>> seq_gen.setNextValue('1')
Traceback (most recent call last):
...
ValueError: setNextValue expected Integer, <type 'str'> found.

>>> seq_gen.setNextValue(3.14)
Traceback (most recent call last):
...
ValueError: setNextValue expected Integer, <type 'float'> found.

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