我可以提供Python类方法作为参数吗？ [英] Can I provide Python class method as a parameter?

问题描述

我想提供一个类的方法作为参数。下面是一个简单的例子。

I would like to provide a method of a class as a parameter. Below is a simple example of what I'm after.

说我有一个类定义如下：

Say I have some class defined like this:

class TestClass(object):

    def __init__(self):
        self.str1 = [1,2,3,4,5]

现在我想向这个类添加一个新方法，该方法将对该列表执行一些操作。此操作将作为此方法的参数提供。所以例如它可能看起来像这样：

Now I want to add a new method to this class that will perform some operation on that list. This operation will be provided as a parameter to this method. So for example it might look something like that:

def testMethod(self, arg1):
    print self.str1.arg1(1)

其中 arg1 一个列表类方法。

想法是能够以下面的方式调用该方法：

The idea is being able to call that method in the below manner:

TC = TestClass()
TC.testMethod("index")

$ b b

并且希望获得一个结果，如下所示：

And expecting to get a result as I would get from:

print self.str1.index(1)

如果我运行它，我会得到一个 AttributeError exception：

If I run it as is, I will get an AttributeError exception:

AttributeError: 'list' object has no attribute 'arg1'

注意：此问题被要求归纳另一个问题，我描述了此处。

NOTE: This question was asked to generalize another issue, I described here.

推荐答案

print getattr(self.str1, arg1)(1)

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