这些是Python异常的属性,但我很难理解它们.Python的文档对此似乎相当平静.我看了一下documentation,但还是有些困惑.那么,这两者的区别是什么?它们是如何使用的?
编辑:在这一点上,它们与__traceback__
有什么关系?
编辑3:我想我只是不明白__cause__
.我终于明白了__traceback__
和__context__
.为什么attribute_error.__cause__
不指AttributeError()
?
try:
raise NameError() from OSError
except NameError as name_error:
print('name_error.__cause__: %s' % repr(name_error.__cause__))
print('name_error.__context__: %s' % repr(name_error.__context__))
print('name_error.__traceback__: %s' % repr(name_error.__traceback__))
try:
raise AttributeError()
except AttributeError as attribute_error:
print('attribute_error.__cause__: %s' % repr(attribute_error.__cause__))
print('attribute_error.__context__: %s' % repr(attribute_error.__context__))
print('attribute_error.__traceback__: %s' % repr(attribute_error.__traceback__))
raise attribute_error from IndexError
这个输出
name_error.__cause__: OSError()
name_error.__context__: None
name_error.__traceback__: <traceback object at 0x000000000346CAC8>
attribute_error.__cause__: None
attribute_error.__context__: NameError()
attribute_error.__traceback__: <traceback object at 0x000000000346CA88>
Traceback (most recent call last):
File "C:\test\test.py", line 13, in <module>
raise attribute_error from IndexError
File "C:\test\test.py", line 8, in <module>
raise AttributeError()
AttributeError