On Mon, Jun 6, 2016, at 01:46, Lawrence D’Oliveiro wrote: > On Monday, June 6, 2016 at 4:06:20 AM UTC+12, Uri Even-Chen wrote: > > Never write expressions, such as 2 ** 3 ** 2 or even 2 * 4 > > + 5, without parentheses. > > That leads to the code equivalent of > <http://i.dailymail.co.uk/i/pix/2011/10/13/article-2048696-03F82C520000044D-302_634x332.jpg>.
Okay, can we settle on, as a principle, "the basic arithmetic operators (not to include **) are the only ones whose precedence can be presumed to be obvious to all readers, and other expressions may/should have parentheses to make it more clear, even when not strictly necessary to the meaning of the expression"? Sure, it's obvious to _me_ that << and >> have higher precedence than & and |, and that "and" has a higher precedence than "or", but can I assume the other people know this? And I don't know offhand the relative precedence of non-conceptually-related groups of operators, except that I'm pretty sure "and" and "or" have very low precedence. [To keep this on-topic, let's assume that this discussion has a goal of getting something along the lines of "always/sometimes/never use "unnecessary" parentheses" into PEP7/PEP8. Speaking of, did you know that C has lower precedence for the bitwise operators &^| than for comparisons? That was something that tripped me up for a very long time and undermined my confidence as to other aspects of the bitwise operators] -- https://mail.python.org/mailman/listinfo/python-list
