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Question

How do I manually throw/raise an exception in python?

Answer 1

+12 A:

Can't get much more pythonic than this:

raise Exception("I know python!")

See the raise statement docs for python if you'd like more info.

Gabriel Hurley 2010-01-12 21:08:45

You forgot this: http://docs.python.org/reference/simple_stmts.html#the-raise-statement

S.Lott 2010-01-12 21:09:27

got it. thanks!

Gabriel Hurley 2010-01-12 21:11:39

I like your exception text. It makes the person who catches it feel good about himself (or herself).

Chris Lutz 2010-01-12 22:10:40

haha, thanks Chris!

Gabriel Hurley 2010-01-12 22:42:30

Answer 2

+1 A:

raise Exception http://www.python.org/dev/peps/pep-3109/

Aly 2010-01-12 21:14:36

If you're suggesting this over Gabriel's answer, you're misreading that PEP. It does not say raise a class instead of an instance: both are fully supported.

Peter Hansen 2010-01-13 02:55:49

Answer 3

+1 A:

BTW You can throw any object

>>> for exc in "String Error", Exception("Real Exception"):
...     try:
...             raise exc
...     except Exception,e :
...             print "Caught:", e
...     except:
...             import traceback
...             traceback.print_exc()
...
Traceback (most recent call last):
  File "<stdin>", line 3, in <module>
String Error
Caught: Real Exception
>>>

thanos 2010-01-12 22:17:08

this possible only in py2.x

SilentGhost 2010-01-12 22:25:31

This isn't even possible on all 2.xs. It will fail in 2.6 and above, after it was deprecated in 2.5. Raising a string is possibly the most horrible suggestion you could give here.

Devin Jeanpierre 2010-01-13 01:08:12

Yes, -1, very bad idea.

Peter Hansen 2010-01-13 02:53:44

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How do I manually throw/raise an exception in python?

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