Re: scope of function parameters

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From	Peter Otten <__peter__@web.de>
Subject	Re: scope of function parameters
Date	Mon, 30 May 2011 11:41:17 +0200
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Laurent Claessens wrote:

> Le 30/05/2011 11:02, Terry Reedy a écrit :
>> On 5/30/2011 3:38 AM, Laurent wrote:
>>
>>>  Cool. I was thinking that "5" was the name, but
>>>   >>>  5.__add__(6)
>>>  File "<stdin>", line 1
>>>  5.__add__(6)
>>
>>
>> Try 5 .__add__(6)
> 
> What is the rationale behind the fact to add a space between "5" and
> ".__add__" ?
> Why does it work ?

It's a hint for the tokenizer.

$ cat show_tokens.py
import sys

from tokenize import generate_tokens
from cStringIO import StringIO
from token import tok_name

_name_width = max(len(name) for name in tok_name.itervalues())

def show_tokens(s):
    for token in generate_tokens(StringIO(s).readline):
        name = tok_name[token[0]]
        value = token[1]
        print "%-*s %r" % (_name_width, name, value)

if __name__ == "__main__":
    show_tokens(" ".join(sys.argv[1:]))

$ python show_tokens.py 5.__add__
NUMBER           '5.'
NAME             '__add__'
ENDMARKER        ''

$ python show_tokens.py 5 .__add__
NUMBER           '5'
OP               '.'
NAME             '__add__'
ENDMARKER        ''

Thread

scope of function parameters Henry Olders <henry.olders@mcgill.ca> - 2011-05-29 04:30 -0400
  Re: scope of function parameters Mel <mwilson@the-wire.com> - 2011-05-29 07:59 -0400
    Re: scope of function parameters Terry Reedy <tjreedy@udel.edu> - 2011-05-29 16:27 -0400
  Re: scope of function parameters Peter Pearson <ppearson@nowhere.invalid> - 2011-05-29 17:21 +0000
    Re: scope of function parameters Ben Finney <ben+python@benfinney.id.au> - 2011-05-30 07:42 +1000
      Re: scope of function parameters Laurent Claessens <moky.math@gmail.com> - 2011-05-30 09:12 +0200
        Re: scope of function parameters Chris Rebert <clp2@rebertia.com> - 2011-05-30 00:27 -0700
        Re: scope of function parameters Laurent <moky.math@gmail.com> - 2011-05-30 09:38 +0200
        Re: scope of function parameters Daniel Kluev <dan.kluev@gmail.com> - 2011-05-30 19:10 +1100
        Re: scope of function parameters Terry Reedy <tjreedy@udel.edu> - 2011-05-30 05:02 -0400
          Re: scope of function parameters Laurent Claessens <moky.math@gmail.com> - 2011-05-30 11:08 +0200
            Re: scope of function parameters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-30 09:14 +0000
            Re: scope of function parameters Ben Finney <ben+python@benfinney.id.au> - 2011-05-30 19:17 +1000
            Re: scope of function parameters Peter Otten <__peter__@web.de> - 2011-05-30 11:41 +0200
              Re: scope of function parameters Laurent Claessens <moky.math@gmail.com> - 2011-05-30 12:10 +0200
              Re: scope of function parameters Laurent Claessens <moky.math@gmail.com> - 2011-05-30 12:10 +0200
            Re: scope of function parameters Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2011-05-30 13:40 +0300
            Re: scope of function parameters Terry Reedy <tjreedy@udel.edu> - 2011-05-30 12:49 -0400
        Re: scope of function parameters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-30 09:16 +0000
  Re: scope of function parameters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-29 23:46 +0000
    Re: scope of function parameters Ben Finney <ben+python@benfinney.id.au> - 2011-05-30 11:31 +1000
      Re: scope of function parameters Chris Angelico <rosuav@gmail.com> - 2011-05-30 11:56 +1000
        Re: scope of function parameters Ben Finney <ben+python@benfinney.id.au> - 2011-05-30 12:08 +1000
          Re: scope of function parameters Chris Angelico <rosuav@gmail.com> - 2011-05-30 12:37 +1000
      Re: scope of function parameters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-30 04:23 +0000
  Re: scope of function parameters rusi <rustompmody@gmail.com> - 2011-05-31 09:46 -0700
    Re: scope of function parameters rusi <rustompmody@gmail.com> - 2011-05-31 10:33 -0700

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