why it is invalid syntax?

Stargaming stargaming at gmail.com
Thu Nov 22 17:46:17 CET 2007


On Thu, 22 Nov 2007 03:24:48 -0800, cokofreedom wrote:

> On Nov 22, 10:58 am, "Guilherme Polo" <ggp... at gmail.com> wrote:
>> 2007/11/22, Stef Mientki <S.Mientki-nos... at mailbox.kun.nl>:
>>
>>
>>
>> > alf wrote:
>> > > Hi,
>>
>> > > I wonder why it is an invalid syntax:
>>
>> > >  >>> if 1: if 1: if 1: print 1
>> > >   File "<stdin>", line 1
>> > >     if 1: if 1: if 1: print 1
>>
>> > > or
>>
>> > >  >>> if 1: for i in range(10): print i
>> > >   File "<stdin>", line 1
>> > >     if 1: for i in range(10): print i
>>
>> > > I would expect one could nest :
>>
>> > Although I agree it might be quit unreadable for normal programmers,
>> > people who are used to writing math formula, (i.e. MatLab), this is
>> > not true.
>>
>> > Here another interesting one, that is accepted:
>>
>> >          self.nodes.extend ( [ ONode(shape,n,self) \
>> >                                for n in range(shape.Parent.N_Outputs)
>> >                                \ if shape.Type_Outputs[n] == type ] )
>>
>> That is a list comprehension
>>
>>
>>
>> > cheers,
>> > Stef
>> > --
>> >http://mail.python.org/mailman/listinfo/python-list
>>
>> --
>> -- Guilherme H. Polo Goncalves
> 
> So acceptable usage (though disgusting :P) would be
> 
> while 1: print 'hello'; print 'goodbye'; exec(rm -rf *)

Nope::

        exec(rm -rf *)
                     ^
    SyntaxError: invalid syntax

Even the syntactically correct ``exec("rm -rf *")`` would make your 
computer explode. Should we introduce this as a shortcut to `break`? ;-)

SCNR,
stargaming



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