How to use str to convert an exception object to string using str in Python?

Question

I have seen code which 'converts' exception objects to the error string using str() like this:

try:
  ...
except Exception, err:
  print str(err)

Does err contain some public 'interface' through which its error string is fetched? I want to have the same functionality for my custom exception class. One way i can think of doing is just define a global str() method for all my exception objects and then inside just return the error string using getter. Is that how I should do it?

Answer 1

只需为您的异常类定义__str__方法即可。