Tom Lynn added the comment: FWIW, this pair of examples differs from the others in this section as they were both explicitly okayed in the first version of PEP 8 <http://hg.python.org/peps/rev/4c31c25bdc03?revcount=120>:: - Use your better judgment for the insertion of spaces around arithmetic operators. Always be consistent about whitespace on either side of a binary operator. Some examples: i = i+1 submitted = submitted + 1 x = x*2 - 1 hypot2 = x*x + y*y c = (a+b) * (a-b) c = (a + b) * (a - b) My guess is that this is still the intention? ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue19560> _______________________________________

Ezio Melotti added the comment: See msg173785. The example in the "no" section is not "wrong" -- it's just worse than the one in the "yes" section because it provides less hints about the groups and it's less readable, so it has no reason to be used. If you note the introductory paragraph it says "Use your better judgment for the insertion of spaces around arithmetic operators.". This means that even if the general rule is to add spaces around the operators, in some situations it is better to omit them, and one should decide on a case by case basis. To provide a further example, see: a = 2 * (b+c) and a = 2*(b+c) - 2/(d+e) The first part -- 2*(b+c) -- is the same in both the examples, but the spaces change depending on the context. In the first case you can emphasize the multiplication between 2 and b+c, whereas in the second case there are two "groups" that get subtracted, so the spaces around the * and / can be removed to emphasize these two bigger groups. I think that section is OK, and doesn't need to be changed. ---------- assignee: docs@python -> gvanrossum nosy: +ezio.melotti, gvanrossum status: open -> pending _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue19560> _______________________________________

Changes by Ezio Melotti <ezio.melotti@gmail.com>: ---------- stage: -> committed/rejected _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue19560> _______________________________________