On Mon, Jul 26, 2010 at 4:31 PM, Steven D'Aprano <st...@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 -- http://mail.python.org/mailman/listinfo/python-list
