python-如何动态创建一个基于从文件中读取的字符串的名称的函数? [英] python - how can I dynamically create a function with a name based on a string read in from a file?

问题描述

假设我有一个包含字符串"unpredictable_words"的文件.我想读这个字符串，然后定义一个函数，如下所示:

Let's say I have a file containing the string "unpredictable_words". I would like to read in this string and then define a function as follows:

def test_unpredictable_words(self):
    do_important_stuff()

然后我想将此函数注入到类定义中，以便可以在此类的任何实例上调用此函数.

I would then like to inject this function into a class definition so that this function can be called on any instances of this class.

我该怎么做?

我对这个答案有些了解- https://stackoverflow.com/a/8160676/1701170 -但是我不认为它确实可以满足我的要求，或者至少我不了解正在发生的事情.

I looked a bit at this answer - https://stackoverflow.com/a/8160676/1701170 - but I don't think it does what I want, exactly, or at least I can't understand what is going on.

推荐答案

Python 2.7.3 (default, Sep 26 2012, 21:51:14) 
>>> def injected(self):
...     print 'injected'
... 
>>> class A(object):
...     pass
... 
>>> A.injected = injected
>>> a = A()
>>> a.injected()
injected
>>> def func2(self):
...     print 'func2'
... 
>>> setattr(A, 'injected2', func2)
>>> a.injected2()
func2
>>> 

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