46 lines
1.0 KiB
Python
46 lines
1.0 KiB
Python
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# -*- coding: utf-8 -*-
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# !/usr/bin/env python
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"""
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-------------------------------------------------
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File Name： utilClass.py
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Description : tool class
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Author : JHao
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date： 2016/12/3
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-------------------------------------------------
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Change Activity:
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2016/12/3: Class LazyProperty
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-------------------------------------------------
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"""
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__author__ = 'JHao'
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class LazyProperty(object):
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"""
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LazyProperty
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explain: http://www.spiderpy.cn/blog/5/
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"""
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def __init__(self, func):
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self.func = func
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def __get__(self, instance, owner):
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if instance is None:
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return self
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else:
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value = self.func(instance)
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setattr(instance, self.func.__name__, value)
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return value
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class Singleton(type):
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"""
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Singleton Metaclass
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"""
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_inst = {}
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def __call__(cls, *args, **kwargs):
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if cls not in cls._inst:
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cls._inst[cls] = super(Singleton, cls).__call__(*args)
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return cls._inst[cls]
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