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Re: semicolon at end of python's statements

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Op 02-09-13 12:42, Fábio Santos schreef:
> On 09/02/2013 10:45 AM, Antoon Pardon wrote:
>> Op 02-09-13 10:05, Steven D'Aprano schreef:
>>> It doesn't keep a whole chain of
>>> if clauses together. It doesn't let you do anything that you haven't
>>> already done. It just saves an indent and a newline. The cost, on the
>>> other hand, includes the risk that people will try to do this:
>>>
>>> for item in seq: if cond:
>>>      do_this()
>>>      do_that()
>>>      else:
>>>          do_something else()
>>>
>>> which is clearly nonsense. Worse is this:
>>>
>>> for item in seq: if cond:
>>>      do_this()
>>>      do_that()
>>> else:
>>>      do_something else()
>>>
>>> which is still nonsense but won't raise SyntaxError.
>> Why shouldn't this raise a SyntaxError?
>>
> Because it would be parsed as a valid for .. else construct. Either that
> or become ambiguous to the programmer, who would not be sure whether he
> was writing an else clause for the `if`, or for the `for`.

I didn't thought about that, but in that case why should we
automatically think of it as nonsense?

I also don't see how this would be that ambigous. The else
lines up with the for, so it seems rather obvious for which
he was writing an else clause.

-- 
Antoon Pardon

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Re: semicolon at end of python's statements "Sam Fourman Jr." <sfourman@gmail.com> - 2013-08-28 22:10 -0400
  Re: semicolon at end of python's statements Alister <alister.ware@ntlworld.com> - 2013-08-29 09:39 +0000
    Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-08-29 19:52 +1000
    Re: semicolon at end of python's statements Fábio Santos <fabiosantosart@gmail.com> - 2013-08-29 11:02 +0100
    Re: semicolon at end of python's statements Ben Finney <ben+python@benfinney.id.au> - 2013-08-30 08:17 +1000
    Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-08-30 08:50 +1000
    Re: semicolon at end of python's statements Ben Finney <ben+python@benfinney.id.au> - 2013-08-30 14:55 +1000
    Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-08-30 09:15 +0200
    Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-08-30 17:25 +1000
    Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-08-30 09:48 +0200
    Re: semicolon at end of python's statements Fábio Santos <fabiosantosart@gmail.com> - 2013-08-30 11:32 +0100
      Re: semicolon at end of python's statements Roy Smith <roy@panix.com> - 2013-08-30 06:53 -0400
        Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-08-30 16:14 +0200
        Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-08-31 08:18 +1000
      Re: semicolon at end of python's statements Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-31 00:09 +0000
        Re: semicolon at end of python's statements Terry Reedy <tjreedy@udel.edu> - 2013-08-31 01:03 -0400
        Re: semicolon at end of python's statements Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-08-31 10:47 +0300
          Re: semicolon at end of python's statements Paul Rudin <paul.nospam@rudin.co.uk> - 2013-08-31 09:00 +0100
            Re: semicolon at end of python's statements Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-08-31 13:28 +0300
            Re: semicolon at end of python's statements Grant Edwards <invalid@invalid.invalid> - 2013-09-02 14:20 +0000
              Re: semicolon at end of python's statements Tim Chase <python.list@tim.thechases.com> - 2013-09-02 09:45 -0500
                Re: semicolon at end of python's statements Roy Smith <roy@panix.com> - 2013-09-02 10:47 -0400
                Re: semicolon at end of python's statements Tim Chase <python.list@tim.thechases.com> - 2013-09-02 12:58 -0500
                Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-09-03 07:07 +1000
        Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-01 19:58 +0200
        Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-01 21:58 +0200
          Re: semicolon at end of python's statements Steven D'Aprano <steve@pearwood.info> - 2013-09-02 08:05 +0000
            Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-02 11:45 +0200
            Re: semicolon at end of python's statements Fábio Santos <fabiosantosart@gmail.com> - 2013-09-02 11:42 +0100
            Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-02 12:58 +0200
            Re: semicolon at end of python's statements "albert visser" <albert.visser@gmail.com> - 2013-09-02 19:44 +0200
              Re: semicolon at end of python's statements Roy Smith <roy@panix.com> - 2013-09-02 13:53 -0400
                Re: semicolon at end of python's statements Neil Cerutti <neilc@norwich.edu> - 2013-09-03 17:15 +0000
                Re: semicolon at end of python's statements Neil Cerutti <neilc@norwich.edu> - 2013-09-03 20:00 +0000
            Re: semicolon at end of python's statements Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-09-02 17:24 -0400
        Re: semicolon at end of python's statements MRAB <python@mrabarnett.plus.com> - 2013-09-02 00:30 +0100
        Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-02 10:29 +0200
          Re: semicolon at end of python's statements Steven D'Aprano <steve@pearwood.info> - 2013-09-02 09:52 +0000
            Re: semicolon at end of python's statements Chris Angelico <rosuav@gmail.com> - 2013-09-02 20:14 +1000
              Re: semicolon at end of python's statements Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-09-02 14:57 +0000
            Re: semicolon at end of python's statements Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-09-02 12:52 +0200
            Re: semicolon at end of python's statements Modulok <modulok@gmail.com> - 2013-09-02 17:17 -0600
              Re: semicolon at end of python's statements Roy Smith <roy@panix.com> - 2013-09-02 19:54 -0400
                Re: semicolon at end of python's statements Modulok <modulok@gmail.com> - 2013-09-02 18:56 -0600

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