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Re: unittest: assertRaises() with an instance instead of a type

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Ben Finney wrote:

> Steven D'Aprano <steve+comp.lang.python@pearwood.info> writes:
> 
>> (By the way, I have to question the design of an exception with error
>> codes. That seems pretty poor design to me. Normally the exception *type*
>> acts as equivalent to an error code.)
> 
> Have a look at Python's built-in OSError. The various errors from the
> operating system can only be distinguished by the numeric code the OS
> returns, so that's what to test on in one's unit tests.
 
The core devs are working to fix that:

$ python3.2 -c'open("does-not-exist")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
IOError: [Errno 2] No such file or directory: 'does-not-exist'
$ python3.3 -c'open("does-not-exist")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
FileNotFoundError: [Errno 2] No such file or directory: 'does-not-exist'

$ python3.2 -c'open("unwritable", "w")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
IOError: [Errno 13] Permission denied: 'unwritable'
$ python3.3 -c'open("unwritable", "w")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
PermissionError: [Errno 13] Permission denied: 'unwritable'

http://www.python.org/dev/peps/pep-3151/

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unittest: assertRaises() with an instance instead of a type Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-03-28 14:28 +0200
  Re: unittest: assertRaises() with an instance instead of a type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-28 18:07 +0000
    Re: unittest: assertRaises() with an instance instead of a type Ben Finney <ben+python@benfinney.id.au> - 2012-03-29 12:55 +1100
      Re: unittest: assertRaises() with an instance instead of a type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-29 06:35 +0000
      Re: unittest: assertRaises() with an instance instead of a type Peter Otten <__peter__@web.de> - 2012-03-29 08:55 +0200
      Re: unittest: assertRaises() with an instance instead of a type Steve Howell <showell30@yahoo.com> - 2012-03-28 22:50 -0700
    Re: unittest: assertRaises() with an instance instead of a type Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-03-29 09:08 +0200
      Re: unittest: assertRaises() with an instance instead of a type Peter Otten <__peter__@web.de> - 2012-03-29 09:48 +0200
      Re: unittest: assertRaises() with an instance instead of a type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-30 02:45 +0000
        Re: unittest: assertRaises() with an instance instead of a type Ethan Furman <ethan@stoneleaf.us> - 2012-03-30 10:45 -0700
    Re: unittest: assertRaises() with an instance instead of a type Ethan Furman <ethan@stoneleaf.us> - 2012-03-29 08:35 -0700
      Re: unittest: assertRaises() with an instance instead of a type Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-30 02:53 +0000
  Re: unittest: assertRaises() with an instance instead of a type Terry Reedy <tjreedy@udel.edu> - 2012-03-28 14:26 -0400
    Re: unittest: assertRaises() with an instance instead of a type Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-03-29 09:28 +0200
      Re: unittest: assertRaises() with an instance instead of a type Terry Reedy <tjreedy@udel.edu> - 2012-03-29 11:04 -0400
    tabs/spaces (was: Re: unittest: assertRaises() with an instance instead of a type) Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-03-29 09:18 +0200
      Re: tabs/spaces (was: Re: unittest: assertRaises() with an instance instead of a type) Roy Smith <roy@panix.com> - 2012-03-29 08:49 -0400
      Re: tabs/spaces Dave Angel <d@davea.name> - 2012-03-29 11:16 -0400
      Re: tabs/spaces Terry Reedy <tjreedy@udel.edu> - 2012-03-29 11:25 -0400
        Re: tabs/spaces Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-03-30 09:05 +0200
          Re: tabs/spaces Dave Angel <d@davea.name> - 2012-03-30 08:47 -0400
            Re: tabs/spaces Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-04-02 09:12 +0200
              Re: tabs/spaces Terry Reedy <tjreedy@udel.edu> - 2012-04-02 03:42 -0400

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