Printing exceptions in Python, instead of raising them

Question

I want to catch a Python exception and print it rather than re-raising it. For example:

def f(x): try: return 1/x except: print <exception_that_was_raised>

This should then do:

>>> f(0) 'ZeroDivisionError'

without an exception being raised.

Is there a way to do this, other than listing each possible exception in a giant try-except-except...except clause?

Ashwini Chaudhary · Accepted Answer · 2012-11-13 16:16:52Z

9

use the message attribute of exception or e.__class__.__name__ if you want the name of the Base exception class , i.e ZeroDivisionError' in your case

In [30]: def f(x): try: return 1/x except Exception as e: print e.message ....: In [31]: f(2) Out[31]: 0 In [32]: f(0) integer division or modulo by zero

In python 3.x the message attribute has been removed so you can simply use print(e) or e.args[0] there, and e.__class__.__name__ remains same.

edited Nov 13, 2012 at 16:16

answered Nov 13, 2012 at 15:55

Ashwini Chaudhary

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5 Comments

mgilson Over a year ago

Or if you just want the exception's name: print e.__class__.__name__

Burhan Khalid Over a year ago

@mgilson's comment is really what the OP asked for; print repr(e) would also work.

alex_jordan Over a year ago

Good, but this won't work if you raise an instance of class Whoa: pass

mgilson Over a year ago

@alex_jordan -- If you raise things which aren't Exceptions, you deserve what you get I think ... quickly looking over the documentation, I'm not even positive that behaviour is well defined.

Ashwini Chaudhary Over a year ago

@BurhanKhalid I think repr(e) returns kind of combination of e.__class__.__name__ and e.args, i.e output is ZeroDivisionError('integer division or modulo by zero',)

c0x6a · Accepted Answer · 2012-11-13 16:06:45Z

3

This is how I work:

try: 0/0 except Exception as e: print e

answered Nov 13, 2012 at 16:06

c0x6a

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Comments

Alexey Sidash · Accepted Answer · 2012-11-13 16:30:06Z

try: 0/0 except ZeroDivisionError,e: print e #will print "integer division or modulo by zero"

Something like this, Pythonic duck typing lets us to convert error instances into strings on the fly=) Good luck =)

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