如何从AttributeError python中提取属性名

Question

我必须从AttributeError中提取名称。我:

x = 10
try:
x.append(20)
except AttributeError as e:
print(f"name of Atrribute is: {e}")

和结果:

name of Atrribute is: 'int' object has no attribute 'append'

我需要'追加'，谢谢!

Answer 1

您可以在空格处拆分消息并取最后一个元素。然后从该元素中剥离'。

x = 10
try:
x.append(20)
except AttributeError as e:
attribute_name = str(e).split()[-1].strip("'")
print(f"name of Atrribute is: {attribute_name}")

输出为name of Atrribute is: append。

请注意，如果Python决定在未来的版本中传递更改的消息，则可能会中断此操作。

Answer 2

对于python >= 3.10,AttributeError的实例具有name和obj属性:

>>> try:
...     'spam'.ham
... except AttributeError as e:
...     print(f'{e.name=}; {e.obj=}')
... 
e.name='ham'; e.obj=spam

如果你手动raise AttributeError，它的name和obj将是None

---

如果你想自己触发AttributeError，你可以手动设置name和obj，例如

class Readonly:
def __setattr__(self, name, _=None):
e = AttributeError(f'{type(self).__name__} instance is readonly')
try:
e.name, e.obj = name, self
raise e from None
finally:
del e
__delattr__ = __setattr__