我试图让 python 允许私有(private)变量，所以我做了这个装饰器，你把它放在类的开头，这样每个函数都会得到一个额外的私有(private)参数，它们可以修改成他们想要的。据我所知，不可能从类外获取变量，但我不是专业人士。
谁能找到一种方法侵入私有(private)对象并从中获取值？有比这更好的方法吗？
python 2.7
#this is a decorator that decorates another decorator. it makes the decorator
#not loose things like names and documentation when it creates a new function
def niceDecorator(decorator):
def new_decorator(f):
g = decorator(f)
g.__name__ = f.__name__
g.__doc__ = f.__doc__
g.__dict__.update(f.__dict__)
return g
new_decorator.__name__ = decorator.__name__
new_decorator.__doc__ = decorator.__doc__
new_decorator.__dict__.update(decorator.__dict__)
return new_decorator
@niceDecorator
#this is my private decorator
def usePrivate(cls):
prv=type('blank', (object,), {})
#creates a blank object in the local scope
#this object will be passed into every function in
#the class along with self which has been renamed
#as pbl (public).
@niceDecorator
#this is the decorator that gets applied to every function
#in the class. in makes it also accept the private argument
def decorate(func):
def run(pub, *args, **kwargs):
return func(pub,prv, *args, **kwargs)
return run
#this loops through every function in the class and applies the decorator
for func in cls.__dict__.values():
if callable(func):
setattr(cls, func.__name__, decorate(getattr(cls, func.__name__)))
return cls
#this is the class we are testing the private decorator with.
#this is what the user would program
@usePrivate
class test():
#sets the value of the private variable
def setValue(pbl,prv,arg):
#pbl (public) is another name for self
#prv (private) acts just like self except its private
prv.test=arg
#gets the value of the private variable
def getValue(pbl,prv):
return prv.test
a=test()
a.setValue(3)
print a.getValue()
最佳答案
简而言之:不要这样做。
There is no need to make things truly private in Python .使用您的软件的人可以看到某些内容是否被标记为私有(private)(变量名称以 _ 开头)，所以他们知道。如果他们仍然想访问它，为什么要阻止他们？
我敢肯定还有一种方法可以解决您的代码 - Python 具有数量惊人的内省(introspection)代码，并且修改类很容易。如果有人真的想得到它，几乎不可能锁定任何东西。
同样值得注意的是，在 Python 中，setter/getter 是没有意义的。目的是允许您添加有关设置/获取属性的代码，python 允许您使用 the property() builtin 来执行此操作。 .
关于python - 这段代码真的是私有(private)的吗？ (Python)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10365193/