如何使用Python将字符串转换为类子属性 [英] How to convert string to class sub-attribute with Python

问题描述

我知道我可以用这样的字符串获取类的属性:

I know I can get a Class's attributes with a string like this:

object.attribute = 'foo'
x = 'attribute'
getattr(object, x)
>>> 'foo'

有没有一种方法可以用字符串更深入"到对象的属性中?换句话说，如果我的对象包含另一个对象，如何使用字符串获取子对象的属性?例如:

Is there a way to "go deeper" into the object's attributes with a string? In other words, if my object contains another object, how can I get the the sub-object's attributes with a string? For example:

object.object.attribute

推荐答案

operator.attrgetter函数执行以下操作:

class Foo: pass
f = Foo()
f.bar = Foo()
f.bar.baz = Foo()
f.bar.baz.quux = "Found me!"

import operator
print operator.attrgetter("bar.baz.quux")(f)     # prints "Found me!"

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