在Python中使用对象的属性进行循环

Question

I am working with objects in Python and all I wanted was to replace the attribute in a for loop to get the data out of the object. Here is my code:

def calculate_something(dictionaryWithObjects):
    for attribute in ['attr1', 'attr2', 'attr3']:
        dataA1, dataA2 = dictionaryWithObjects['Object1'].attribute
        dataB1, dataB2 = dictionaryWithObjects['Object2'].attribute
        dataC1, dataC2 = dictionaryWithObjects['Object3'].attribute

So this is more or less what I think I need. I will use the data for calculations afterwards. But it gives an error saying that the object has no attribute called ".attribute". Of course it doesn't, I meant it to replace the 'attr1' in there.

What am I doing wrong?

Answer 1

为了按名称访问实例属性，应使用[Python]： getattr （ object，name [，default] ） ，例如：

dataA1, dataA2 = getattr(dictionaryWithObjects['Object1'], attribute)

Answer 2

Try something like this:

def calculate_something(dictionaryWithObjects):
    for attribute in ['attr1', 'attr2', 'attr3']:
        dataA1, dataA2 = dictionaryWithObjects['Object1'][attribute]

Answer 3

您可以使用eval ：

data=eval('Object1.'+attribute)