Python Newbie

[Joshua Landau]

On 25 February 2013 02:08, Dennis Lee Bieber <wlfraed at ix.netcom.com> wrote:

> On Sun, 24 Feb 2013 21:58:36 +0000, Joshua Landau
> <joshua.landau.ws at gmail.com> declaimed the following in
> gmane.comp.python.general:
>
>
> >
> > condition1 = long_condition_expression_1
> > condition2 = long_condition_expression_2
> > condition3 = long_condition_expression_3
> >
> > if condition1 and condition2 and condition3:
> >     STUFF
> >
> > No multiline needed. If you have *many* conditions, then:
> >
>         Except that Python does short-circuit evaluation; your scheme will
> fail in some situations:
>
> >>> x = 0
> >>> if x != 0 and 32 / x > 4:
> ...     print "we passed"
> ...
> >>> c1 = x != 0
> >>> c2 = 32 / x > 4
> Traceback (most recent call last):
>   File "<interactive input>", line 1, in <module>
> ZeroDivisionError: integer division or modulo by zero
> >>>
>

Yeah, well... context*.

There are perfectly legitimate ways of doing that too.

A simple one would be:

> supercondition = (
>     long_condition_expression_1 and
>     long_condition_expression_2 and
>     long_condition_expression_3
> )
>
> if supercondition: ...

Please note the problem of the original is that the indentation dedents and
indents in too quick a sequence:

> if (
> something_here): # Where do I indent this to?
>     something_else

There are standards, but I don't like the style. I thought it worth
mentioning as we were all being subjective anyway ;P. It's much worse than:

> if something_here: something_else #on the same line

which is already explicitly advised against.

* By which I mean: fair point
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