Bug or intended behavior?

[Marko Rauhamaa]

Peter Pearson <pkpearson at nowhere.invalid>:

> On Fri, 2 Jun 2017 10:17:05 -0700 (PDT), sean.dizazzo at gmail.com wrote:
> [snip]
>>>>> 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'
>
> Others have already pointed out that you're assuming the
> wrong precedence:
>
> Say
>     "foo %s" % (1-2)
> not
>     ("foo %s" % 1) - 2

Python's killer feature is the dependence on indentation, that is,
visual grouping. If they look like they belong together, they belong
together.

Interestingly, however, Python hasn't extended that principle to the
expression syntax. You could have:

   >>> 1 + 2*3
   7
   >>> 1+2 * 3
   9


Marko