如何动态添加成员到类中

发布于 2024-10-19 23:59:11 字数 454 浏览 6 评论 0原文

我的问题可以用这段代码简单地说明：

def proceed(self, *args):
  myname = ???
  func = getattr(otherobj, myname)
  result = func(*args)
  # result = ... process result  ..
  return result


class dispatch(object):
  def __init__(self, cond=1):
    for index in range(1, cond):
      setattr(self, 'step%u' % (index,), new.instancemethod(proceed, self, dispatch)

在调度实例必须有step1..stepn成员之后，调用 otherobj 中的相应方法。怎么做呢？或者更具体地说：必须是什么插入到“myname =”之后继续吗？

原文

My question can be simply illustrated by this code:

def proceed(self, *args):
  myname = ???
  func = getattr(otherobj, myname)
  result = func(*args)
  # result = ... process result  ..
  return result


class dispatch(object):
  def __init__(self, cond=1):
    for index in range(1, cond):
      setattr(self, 'step%u' % (index,), new.instancemethod(proceed, self, dispatch)

After that instance of dispatch must have step1..stepn members, that call
corresponding methods in otherobj. How to do that? Or more specifically: What must be
inserted in proceed after 'myname =' ?

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无人接听 2024-10-26 23:59:11

不确定这是否有效，但您可以尝试利用闭包：

def make_proceed(name):
    def proceed(self, *args):
        func = getattr(otherobj, name)
        result = func(*args)
        # result = ... process result  ..
        return result
    return proceed


class dispatch(object):
  def __init__(self, cond=1):
    for index in range(1, cond):
      name = 'step%u' % (index,)
      setattr(self, name, new.instancemethod(make_proceed(name), self, dispatch))

Not sure if this works, but you could try to exploit closures:

def make_proceed(name):
    def proceed(self, *args):
        func = getattr(otherobj, name)
        result = func(*args)
        # result = ... process result  ..
        return result
    return proceed


class dispatch(object):
  def __init__(self, cond=1):
    for index in range(1, cond):
      name = 'step%u' % (index,)
      setattr(self, name, new.instancemethod(make_proceed(name), self, dispatch))

回复收藏 0 原文

静谧幽蓝 2024-10-26 23:59:11

如果方法被称为step1到stepn，你应该这样做：

def proceed(myname):
    def fct(self, *args):
        func = getattr(otherobj, myname)
        result = func(*args)
        return result
    return fct

class dispatch(object):
    def __init__(self, cond=1):
        for index in range(1, cond):
            myname = "step%u" % (index,)
            setattr(self, myname, new.instancemethod(proceed(myname), self, dispatch))

如果你不知道名字，我不明白你想要实现什么。

If the methods are called step1 to stepn, you should do:

def proceed(myname):
    def fct(self, *args):
        func = getattr(otherobj, myname)
        result = func(*args)
        return result
    return fct

class dispatch(object):
    def __init__(self, cond=1):
        for index in range(1, cond):
            myname = "step%u" % (index,)
            setattr(self, myname, new.instancemethod(proceed(myname), self, dispatch))

If you don't know the name, I don't understand what you're trying to achieve.

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