On 2-6-2017 19:17, sean.diza...@gmail.com wrote: > 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 % operator has higher precedence than the - operator. See https://docs.python.org/3/reference/expressions.html#operator-precedence So what you wrote is equivalent to: print ("foo %s" % 1) - 2 which means subtract the number 2 from the string "foo 1". Hence the error. Solution is to use parentheses to make sure the things are evaluated in the order you intended: print "foo %s" % (1-2) Irmen -- https://mail.python.org/mailman/listinfo/python-list
