How to use an Exception's attributes in Python?

Question

Is there a way to use the attributes/properties of an Exception object in a try-except block in Python?

For example in Java we have:

try {
    // Some code
} catch(Exception e) {
    // Here we can use some of the attributes of "e"
}

What equivalent in Python would give me a reference to e?

Asked By: Kozet

||

Source

Answer 1

Use the as statement. You can read more about this in Handling Exceptions.

>>> try:
...     print(a)
... except NameError as e:
...     print(dir(e))  # print attributes of e
...
['__cause__', '__class__', '__context__', '__delattr__', '__dict__', '__doc__', '__eq__',
 '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__',
 '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__',
 '__setstate__', '__sizeof__', '__str__', '__subclasshook__', '__traceback__', 'args',
 'with_traceback']

Answered By: Ashwini Chaudhary

Answer 2

Sure, there is:

try:
    # some code
except Exception as e:
    # Here we can use some the attribute of "e"

Answered By: phihag

Answer 3

Here is an example from the docs:

class MyError(Exception):
   def __init__(self, value):
       self.value = value

   def __str__(self):
      return repr(self.value)

try:
     raise MyError(2*2)
except MyError as e:
     print 'My exception occurred, value:', e.value

Answered By: WeaklyTyped

How to use an Exception's attributes in Python?

Question:

Answers: