On Friday, June 2, 2017 at 10:46:03 AM UTC-7, bob gailer wrote: > On 6/2/2017 1:28 PM, Jussi Piitulainen wrote: > > sean.diza...@gmail.com writes: > > > >> Can someone please explain this to me? Thanks in advance! > >> > >> ~Sean > >> > >> > >> Python 2.7.13 (v2.7.13:a06454b1afa1, Dec 17 2016, 12:39:47) > >> [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin > >> Type "help", "copyright", "credits" or "license" for more information. > >>>>> print "foo %s" % 1-2 > >> Traceback (most recent call last): > >> File "<stdin>", line 1, in <module> > >> TypeError: unsupported operand type(s) for -: 'str' and 'int' > > The per cent operator has precedence over minus. Spacing is not > > relevant. Use parentheses. > > > In other words "foo %s" % 1 is executed, giving "1". Then "1"-2 is > attempted giving the error. > Also: If there is more than one conversion specifier the right argument > to % must be a tuple. > I usually write a tuple even if there is only one conversion specifier - > that avoids the problem > you encountered and makes it easy to add more values when you add more > conversion specifiers. > > print "foo %s" % (1-2,) > > Bob Gailer
I get what it's doing, it just doesn't make much sense to me. Looking at operator precedence, I only see the % operator in regards to modulus. Nothing in regards to string formatting. Is it just a side effect of the % being overloaded in strings? Or is it intentional that it's higher precedence...and why? Maybe I'm making too big a deal of it. It just doesn't 'feel' right to me. ~Sean -- https://mail.python.org/mailman/listinfo/python-list
