我有一个由外部库提供给我的课程.我已经创建了这个类的子类.我也有一个原始类的实例.
我现在想要将此实例转换为我的子类的实例,而不更改实例已有的任何属性(除了我的子类覆盖的那些属性).
以下解决方案似乎有效.
# This class comes from an external library. I don't (want) to control
# it, and I want to be open to changes that get made to the class
# by the library provider.
class Programmer(object):
def __init__(self,name):
self._name = name
def greet(self):
print "Hi, my name is %s." % self._name
def hard_work(self):
print "The garbage collector will take care of everything."
# This is my subclass.
class C_Programmer(Programmer):
def __init__(self, *args, **kwargs):
super(C_Programmer,self).__init__(*args, **kwargs)
self.learn_C()
def …我正在审查一些旧的python代码并经常遇到这个'模式':
class Foo(object):
def __init__(self, other = None):
if other:
self.__dict__ = dict(other.__dict__)
这是复制构造函数通常在Python中实现的方式吗？
我想知道是否有可能像在java中一样在python中执行复制构造函数,这是我的java代码,常规承包商和复制构造函数.如何在python中编写以下代码？谢谢
public Date(int day, int month, int year)
{
_day = day;
_month = month;
_year = year;
if(!checkDate(_day,_month,_year))
{
_day = DEFAULT_DAY;
_month = DEFAULT_DAY;
_year = DEFAULT_YEAR;
}
}
/**
* Copy constructor.
*/
public Date (Date other)
{
if(other != null)
{
_day = other._day;
_month = other._month;
_year = other._year;
}
}