Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #33406

Re: Is there a simpler way to modify all arguments in a function before using the arguments?

Show key headers only | View raw

brucegoodstein@gmail.com wrote:

> Using a decorator works when named arguments are not used. When named arguments are used, unexpected keyword error is reported. Is there a simple fix?

Extend def wrapper(*args) to handle *kwargs as well

Emile

> Code:
> -----
> 
> from functools import wraps
> 
> def fix_args(fn):
>     @wraps(fn)
>     def wrapper(*args):
>         args = (arg.replace('_', '') for arg in args)
>         return fn(*args)
>     return wrapper
>     
> @fix_args
> def foo(a1="", a2="", b1="", b2=""):
>      print(a1)
>      print(a2) 
>      print(b1)
>      print(b2) 
>      
> foo ('a1a1_x', 'a2a2_x', 'b1b1_x', 'b2b2_____x')
> foo (a1='a1a1_x', a2='a2a2_x', b1='b1b1_x', b2='b2b2_____x')
> 
> Results:
> --------
> a1a1x
> a2a2x
> b1b1x
> b2b2x
> Traceback (most recent call last):
>   File "C:\WORK\masterDB_Update\argtest.py", line 19, in <module>
>     foo (a1='a1a1_x', a2='a2a2_x', b1='b1b1_x', b2='b2b2_____x')
> TypeError: wrapper() got an unexpected keyword argument 'a1'

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Is there a simpler way to modify all arguments in a function before using the arguments? bruceg113355@gmail.com - 2012-11-09 16:48 -0800
  Re: Is there a simpler way to modify all arguments in a function before using the arguments? Roy Smith <roy@panix.com> - 2012-11-09 20:05 -0500
    Re: Is there a simpler way to modify all arguments in a function before using the arguments? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-11-10 01:16 +0000
      Re: Is there a simpler way to modify all arguments in a function before using the arguments? bruceg113355@gmail.com - 2012-11-10 05:15 -0800
        Re: Is there a simpler way to modify all arguments in a function before using the arguments? Chris Angelico <rosuav@gmail.com> - 2012-11-11 05:33 +1100
  Re: Is there a simpler way to modify all arguments in a function before using the arguments? Paul Rubin <no.email@nospam.invalid> - 2012-11-09 18:52 -0800
    Re: Is there a simpler way to modify all arguments in a function before using the arguments? Chris Angelico <rosuav@gmail.com> - 2012-11-10 14:56 +1100
      Re: Is there a simpler way to modify all arguments in a function before using the arguments? Paul Rubin <no.email@nospam.invalid> - 2012-11-09 20:05 -0800
        Re: Is there a simpler way to modify all arguments in a function before using the arguments? Chris Angelico <rosuav@gmail.com> - 2012-11-10 20:19 +1100
  Re: Is there a simpler way to modify all arguments in a function before using the arguments? Miki Tebeka <miki.tebeka@gmail.com> - 2012-11-09 20:17 -0800
    Re: Is there a simpler way to modify all arguments in a function before using the arguments? Peter Otten <__peter__@web.de> - 2012-11-10 10:09 +0100
      Re: Is there a simpler way to modify all arguments in a function before using the arguments? aahz@pythoncraft.com (Aahz) - 2012-11-10 07:35 -0800
        Re: Is there a simpler way to modify all arguments in a function before using the arguments? bruceg113355@gmail.com - 2012-11-10 09:56 -0800
        Re: Is there a simpler way to modify all arguments in a function before using the arguments? Peter Otten <__peter__@web.de> - 2012-11-11 10:28 +0100
        Re: Is there a simpler way to modify all arguments in a function before using the arguments? brucegoodstein@gmail.com - 2012-11-15 15:20 -0800
          Re: Is there a simpler way to modify all arguments in a function before using the arguments? Emile van Sebille <emile@fenx.com> - 2012-11-15 16:03 -0800
          Re: Is there a simpler way to modify all arguments in a function before using the arguments? Ethan Furman <ethan@stoneleaf.us> - 2012-11-15 20:00 -0800
            Re: Is there a simpler way to modify all arguments in a function before using the arguments? bruceg113355@gmail.com - 2012-11-16 07:00 -0800
              Re: Is there a simpler way to modify all arguments in a function before using the arguments? Ethan Furman <ethan@stoneleaf.us> - 2012-11-16 13:30 -0800
            Re: Is there a simpler way to modify all arguments in a function before using the arguments? bruceg113355@gmail.com - 2012-11-16 07:00 -0800
  Re: Is there a simpler way to modify all arguments in a function before using the arguments? Steve Howell <showell30@yahoo.com> - 2012-11-11 09:45 -0800

csiph-web