python styles: why Use spaces around arithmetic operators?

[geremy condra]

On Mon, Jul 26, 2010 at 4:31 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:
> On Mon, 26 Jul 2010 17:20:09 -0500, Peng Yu wrote:
>
>> This webpage http://www.python.org/dev/peps/pep-0008/ recommends the
>> following. It looks to me that both styles are fine. Could anybody let
>> me know what the rationale is behind this recommendation?
>>
>>     - Use spaces around arithmetic operators:
>
> Because it looks better and is easier to read. Operators are small
> (single characters) and sometimes need space around them to stand out.
>
>>           i=i+1
>
> See? It's hideously ugly and cramped. It's much worse if you use larger
> names:
>
> sensiblynamedvariable=sensiblynamedvariable+1
>
> But use your common sense. I usually group powers, multiplications and
> divisions, and separate additions and subtractions:
>
> y = 2*x + 1 - (3*x - 4/(2 + x**2))**-2
>
> And unary + and - operators should always be grouped with their operand:
>
> y = -2  # not "- 2"

This is the rule that I use, with the exception that I will generally
explicitly parenthesize the numerator in a division, since my eyes
frequently gloss over the / symbol for some reason.

Geremy Condra