python @property @*.setter python

在python 代码中有时候可以看到如下片段：

@property def tick(self): return self._tick@tick.setter def tick(self, tick): self._tick = tick self.save_netnode()

片段来自于下面的类定义中

class Core(Module): ............. def __init__(self, plugin): super(Core, self).__init__(plugin) self._project = None self._database = None self._tick = 0 self._users = {}self._idb_hooks = None self._idp_hooks = None self._hxe_hooks = Noneself._idb_hooks_core = None self._idp_hooks_core = None self._ui_hooks_core = None self._view_hooks_core = None self._hooked = False@property def project(self): return self._project@project.setter def project(self, project): self._project = project self.save_netnode()@property def database(self): return self._database@database.setter def database(self, database): self._database = database self.save_netnode()@property def tick(self): return self._tick@tick.setter def tick(self, tick): self._tick = tick self.save_netnode() .................................

解读如下：
@property 可以将 python 定义的函数 “当做” 属性访问，从而提供更加友好访问方式，但是有时候setter/deleter也是需要的。

只有 @property 表示只读
同时有 @property 和 @*.setter 表示可读可写
同时有 @property和 @.setter 和 @.deleter 表示可读可写可删除

【python @property @*.setter】简单 demo 如下

zhangji16@zhangji16vm:/tmp$ cat tmp3.py #!/usr/bin/env python # coding=utf-8 class ball(object):def __init__(self, b_id = '001'): self.__id = b_id@property def size(self): print("here here!!!") return self._size@size.setter def size(self, b_size): if type(b_size) != int: raise ValueError('size should be an integer!') print("size setted!!!") self._size = b_size@property def get_id(self): return self.__idb = ball('002') b.size = 20 print b.size print b.get_id zhangji16@zhangji16vm:/tmp$ python -i tmp3.py size setted!!! here here !!! 20 002