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Re: I love the decorator in Python!!!

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Date Thu, 08 Dec 2011 15:34:13 -0800
From Ethan Furman <ethan@stoneleaf.us>
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Chris Angelico wrote:
> One piece of sophistication that I would rather like to see, but don't
> know how to do. Instead of *args,**kwargs, is it possible to somehow
> copy in the function's actual signature? I was testing this out in
> IDLE, and the fly help for the function no longer gave useful info
> about its argument list.

If you want to roll your own, it looks something like this:

2.x code
----------------------------------------------------------------------
def trace(func, debugmode=debugmode):
     if debugmode:
         name = func.__name__
         argspec = inspect.getargspec(func)
         signature = inspect.formatargspec(
             formatvalue=lambda val: "", *argspec)[1:-1] # trim parens
         new_func = (
                     'def _wrapper_(%(signature)s):\n'
                     '    print(">"+func.__name__)\n'
                     '    result = func(%(signature)s)\n'
                     '    print("<"+func.__name__)\n'
                     '    return result\n'
                     % {'signature':signature}
                     )
         evaldict = {'func':func}
         exec new_func in evaldict
         wrapped = evaldict['_wrapper_']
         wrapped.__name__ = name
         wrapped.__doc__ = func.__doc__
         wrapped.__module__ = func.__module__
         wrapped.__dict__ = func.__dict__
         wrapped.func_defaults = func.func_defaults
         return wrapped
     return func
----------------------------------------------------------------------

The downside (which you get even with Michele's decorator module) is 
that tracebacks aren't quite as clean.

~Ethan~

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Thread

I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-07 23:18 -0800
  Re: I love the decorator in Python!!! Chris Rebert <clp2@rebertia.com> - 2011-12-08 00:04 -0800
  Re: I love the decorator in Python!!! Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-12-08 09:59 +0100
    Re: I love the decorator in Python!!! Chris Angelico <rosuav@gmail.com> - 2011-12-08 20:37 +1100
    Re: I love the decorator in Python!!! K.-Michael Aye <kmichael.aye@gmail.com> - 2011-12-08 12:22 +0100
      Re: I love the decorator in Python!!! Francesco Bochicchio <bieffe62@gmail.com> - 2011-12-09 04:00 -0800
    Re: I love the decorator in Python!!! Chris Angelico <rosuav@gmail.com> - 2011-12-08 22:43 +1100
      Re: I love the decorator in Python!!! Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-12-09 10:57 +0100
      Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-09 10:28 -0800
        Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-09 16:21 -0800
        Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-09 16:21 -0800
          Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-10 06:04 -0800
            Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-10 06:09 -0800
              Re: I love the decorator in Python!!! alex23 <wuwei23@gmail.com> - 2011-12-11 19:35 -0800
            Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-10 06:09 -0800
          Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-10 06:04 -0800
      Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-09 10:28 -0800
    Re: I love the decorator in Python!!! K.-Michael Aye <kmichael.aye@gmail.com> - 2011-12-08 17:24 +0100
    Re: I love the decorator in Python!!! Chris Angelico <rosuav@gmail.com> - 2011-12-09 03:38 +1100
      Re: I love the decorator in Python!!! alex23 <wuwei23@gmail.com> - 2011-12-08 21:02 -0800
        Re: I love the decorator in Python!!! Robert Kern <robert.kern@gmail.com> - 2011-12-09 10:08 +0000
          Re: I love the decorator in Python!!! alex23 <wuwei23@gmail.com> - 2011-12-11 19:36 -0800
            Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-11 20:51 -0800
              Re: I love the decorator in Python!!! alex23 <wuwei23@gmail.com> - 2011-12-11 21:47 -0800
                Re: I love the decorator in Python!!! 88888 Dihedral <dihedral88888@googlemail.com> - 2011-12-12 04:16 -0800
            Re: I love the decorator in Python!!! Ethan Furman <ethan@stoneleaf.us> - 2011-12-11 23:47 -0800
            Re: I love the decorator in Python!!! Robert Kern <robert.kern@gmail.com> - 2011-12-12 16:27 +0000
              Re: I love the decorator in Python!!! alex23 <wuwei23@gmail.com> - 2011-12-12 16:46 -0800
    Re: I love the decorator in Python!!! Andrew Berg <bahamutzero8825@gmail.com> - 2011-12-08 10:54 -0600
    Re: I love the decorator in Python!!! Andrew Berg <bahamutzero8825@gmail.com> - 2011-12-08 10:55 -0600
    Re: I love the decorator in Python!!! Ethan Furman <ethan@stoneleaf.us> - 2011-12-08 15:34 -0800
    Re: I love the decorator in Python!!! Ethan Furman <ethan@stoneleaf.us> - 2011-12-08 15:56 -0800

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