Re: Any comment on using ctypesgen package?

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From	Chris Angelico <rosuav@gmail.com>
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Subject	Re: Any comment on using ctypesgen package?
Date	Fri, 4 Mar 2016 23:00:13 +1100
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On Fri, Mar 4, 2016 at 10:08 PM,  <jfong@ms4.hinet.net> wrote:
> Below is the troubled codes in file lex.py:
> Note: In original codes (before 2To3 modify), there is "types.ObjectType" instead of "object".
> ---------
> # Available instance types.  This is used when lexers are defined by a class.
> # It's a little funky because I want to preserve backwards compatibility
> # with Python 2.0 where types.ObjectType is undefined.
> try:
>     _INSTANCETYPE = (types.InstanceType, object)
> except AttributeError:
>     _INSTANCETYPE = types.InstanceType
>     class object: pass   # Note: needed if no new-style classes present
> -----------
> The author had put some comments above these codes but I have no idea what he is talking about.

I'm not sure exactly what this is trying to do, but if it's just for
isinstance testing, you can save yourself a lot of trouble. In Python
3, *every* type inherits from 'object'. So _INSTANCETYPE can be set to
just object - and anything that's trying to query that can simply
assume it's true.

ChrisA

Thread

Any comment on using ctypesgen package? jfong@ms4.hinet.net - 2016-03-04 03:08 -0800
  Re: Any comment on using ctypesgen package? Chris Angelico <rosuav@gmail.com> - 2016-03-04 23:00 +1100
  Re: Any comment on using ctypesgen package? Peter Otten <__peter__@web.de> - 2016-03-04 13:35 +0100
    Re: Any comment on using ctypesgen package? jfong@ms4.hinet.net - 2016-03-04 21:35 -0800
      Re: Any comment on using ctypesgen package? Chris Angelico <rosuav@gmail.com> - 2016-03-05 16:49 +1100
        Re: Any comment on using ctypesgen package? jfong@ms4.hinet.net - 2016-03-05 00:14 -0800
          Re: Any comment on using ctypesgen package? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-05 11:59 +0000
            Re: Any comment on using ctypesgen package? jfong@ms4.hinet.net - 2016-03-06 16:57 -0800

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