Python 具有类方法的类装饰器
我已经编写了一个类装饰器,monkey对一个类进行了修补,覆盖了init,并添加了一个persist()方法。到目前为止一切正常 现在我需要向修饰类添加一个类方法(静态方法)。要使staticMethod()成为修饰类的静态方法,我需要在代码中做哪些更改 这是我的代码:Python 具有类方法的类装饰器,python,decorator,Python,Decorator,我已经编写了一个类装饰器,monkey对一个类进行了修补,覆盖了init,并添加了一个persist()方法。到目前为止一切正常 现在我需要向修饰类添加一个类方法(静态方法)。要使staticMethod()成为修饰类的静态方法,我需要在代码中做哪些更改 这是我的代码: #! /usr/bin/env python # -*- coding: utf-8 -*- class Persistent (object): def __init__ (self, table = None, r
#! /usr/bin/env python
# -*- coding: utf-8 -*-
class Persistent (object):
def __init__ (self, table = None, rmap = None):
self.table = table
self.rmap = rmap
def __call__ (self, cls):
cls.table = self.table
cls.rmap = self.rmap
oinit = cls.__init__
def finit (self, *args, **kwargs):
print "wrapped ctor"
oinit (self, *args, **kwargs)
def persist (self):
print "insert into %s" % self.table
pairs = []
for k, v in self.rmap.items (): pairs.append ( (v, getattr (self, k) ) )
print "(%s)" % ", ".join (zip (*pairs) [0] )
print "values (%s)" % ", ".join (zip (*pairs) [1] )
def staticMethod (): print "I am static"
cls.staticMethod = staticMethod
cls.__init__ = finit
cls.persist = persist
return cls
@Persistent (table = "tblPerson", rmap = {"name": "colname", "age": "colage"} )
class Test (object):
def __init__ (self, name, age):
self.name = name
self.age = age
a = Test ('John Doe', '23')
a.persist ()
Test.staticMethod ()
输出为:
wrapped ctor
insert into tblPerson
(colage, colname)
values (23, John Doe)
Traceback (most recent call last):
File "./w2.py", line 39, in <module>
Test.staticMethod ()
TypeError: unbound method staticMethod() must be called with Test instance as first argument (got nothing instead)
插入tblPerson
(colage,colname)
价值观(23,无名氏)
回溯(最近一次呼叫最后一次):
文件“/w2.py”,第39行,在
试验方法()
TypeError:必须使用测试实例作为第一个参数调用未绑定的方法staticMethod()(而不是获取任何内容)
或
使用@staticmethoddecorator
@staticmethod
def staticMethod() : ...
非常感谢。有时它很简单,Python有时有奇怪的语法。
def staticMethod (): print "I am static"
cls.staticMethod = staticmethod(staticMethod)
@staticmethod
def staticMethod() : ...