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Re: semicolon at end of python's statements

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On 01/09/2013 20:58, Antoon Pardon wrote:
> Op 31-08-13 02:09, Steven D'Aprano schreef:
>> On Fri, 30 Aug 2013 11:32:17 +0100, Fábio Santos wrote:
>>
>
>>
>> We really are spoiled for choice here. We can write any of these:
>>
>> # Option 1
>> for spam in sequence:
>>      if predicate(spam):
>>          process(spam)
>>
>
>>
>> Adding a fourth option:
>>
>> for spam in sequence if predicate(spam):
>>      process(spam)
>>
>> saves absolutely nothing except a line and an indent level, neither of
>> which are in short supply, and gains nothing in readability over Option 1.
>
> So what is the big difference between this situation and the following:
>
> | else:
> |     if condition:
> |         whatever
>
> which in python we can write:
>
> | elif condition:
> |     whatever
>
>
> So either is seems this was a design mistake or a line and an indent
> level can be important enough to allow a combination of controls.
>
'elif' is for cascading ifs:

if ...:
    ...
elif ...:
    ...
elif ...:
    ...
elif ...:
    ...
else:
    ...

Without 'elif' you would be forced to write:

if ...:
    ...
else:
     if ...:
        ...
     else:
         if ...:
            ...
         else:
             if ...:
                ...
             else:
                ...

On the other hand, for...if is much less of a problem.

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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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