Re: Bug with help (was Re: Getting a list of all modules)

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From	Terry Reedy <tjreedy@udel.edu>
Subject	Re: Bug with help (was Re: Getting a list of all modules)
Date	Sat, 02 Aug 2014 14:17:26 -0400
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On 8/2/2014 8:13 AM, Robert Kern wrote:
> On 2014-08-02 09:33, Heinz Schmitz wrote:
>> Akira Li wrote:
>>
>>>>> Look at how `help('modules')` is implemented. Though it crashes on my
>>>>> system.
>>
>>>> Have you reported this at bugs.python.org or is there already an issue
>>>> for the problem that you see?
>>
>>> It is this issue for python2.7:
>>> https://bugs.launchpad.net/ubuntu/+source/python2.7/+bug/896836
>>>
>>> python3 doesn't crash with currently installed packages.
>>
>> Python 2.7 on Windows XP Sp2 doesn't crash with this. So it seems to
>> be a python<->OS-problem.

It is a local system problem.

> Well, it's just that `help('modules')` imports every module in the
> calling process (at least in Python 2.7; I haven't checked Python 3).
> Some extension modules conflict with each other and cause a crash when
> both are imported together. It's possible that you just don't have such
> modules installed. While the proximate cause of the crash is in the 3rd
> party modules, Python could (and maybe Python 3 does) import each module
> in a separate subprocess and collect the information that way.

That would slow down help('modules') much more.  The suggestion in
http://bugs.python.org/issue12902
"help("modules") executes module code"
is that help() should instead parse the module to get the docstring.

-- 
Terry Jan Reedy

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Thread

Getting a list of all modules Steven D'Aprano <steve@pearwood.info> - 2014-07-30 07:43 +0000
  Re: Getting a list of all modules Chris Angelico <rosuav@gmail.com> - 2014-07-30 18:33 +1000
  Re: Getting a list of all modules Peter Otten <__peter__@web.de> - 2014-07-30 10:46 +0200
  Re: Getting a list of all modules Robert Kern <robert.kern@gmail.com> - 2014-07-30 11:35 +0100
  Re: Getting a list of all modules Leo Jay <python.leojay@gmail.com> - 2014-07-30 21:22 +0800
    Re: Getting a list of all modules Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-07-31 10:41 +0000
      Re: Getting a list of all modules Roy Smith <roy@panix.com> - 2014-07-31 07:55 -0400
        Re: Getting a list of all modules Chris Angelico <rosuav@gmail.com> - 2014-07-31 23:13 +1000
      Re: Getting a list of all modules Terry Reedy <tjreedy@udel.edu> - 2014-07-31 15:59 -0400
      Re: Getting a list of all modules Robert Kern <robert.kern@gmail.com> - 2014-08-01 14:39 +0100
        Re: Getting a list of all modules Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-01 15:41 +0000
          Re: Getting a list of all modules jonnicoll11@googlemail.com - 2014-08-02 14:13 -0700
            Re: Getting a list of all modules Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-02 22:22 +0100
          Re: Getting a list of all modules Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-03 14:38 +0100
  Re: Getting a list of all modules Chris Angelico <rosuav@gmail.com> - 2014-07-30 23:27 +1000
  Re: Getting a list of all modules wxjmfauth@gmail.com - 2014-07-30 06:42 -0700
  Re: Getting a list of all modules Ian Kelly <ian.g.kelly@gmail.com> - 2014-07-30 08:29 -0600
  Re: Getting a list of all modules Skip Montanaro <skip@pobox.com> - 2014-07-30 09:45 -0500
  Re: Getting a list of all modules Akira Li <4kir4.1i@gmail.com> - 2014-07-31 22:55 +0400
  Bug with help (was Re: Getting a list of all modules) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-07-31 20:19 +0100
  Re: Bug with help (was Re: Getting a list of all modules) Terry Reedy <tjreedy@udel.edu> - 2014-07-31 16:15 -0400
  Re: Bug with help (was Re: Getting a list of all modules) Akira Li <4kir4.1i@gmail.com> - 2014-08-02 06:17 +0400
    Re: Bug with help (was Re: Getting a list of all modules) Heinz Schmitz <HeinzSchmitz@gmx.net> - 2014-08-02 10:33 +0200
      Re: Bug with help (was Re: Getting a list of all modules) Robert Kern <robert.kern@gmail.com> - 2014-08-02 13:13 +0100
      Re: Bug with help (was Re: Getting a list of all modules) Terry Reedy <tjreedy@udel.edu> - 2014-08-02 14:17 -0400

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