python - 未捕获 TypeError 异常

Question

为什么这个 TypeError 没有被异常捕获？

>>> op=None
>>> try:
...     val = op['one']
... except KeyError, TypeError:
...     val = "one"
... 
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
TypeError: 'NoneType' object has no attribute '__getitem__'
>>> 

Answer 1

您必须将异常(exception)列表括在括号中:

except (KeyError, TypeError):
    #  ^                   ^
    val = "one"