Bug or intended behavior?

[bob gailer]

On 6/2/2017 1:28 PM, Jussi Piitulainen wrote:
> sean.dizazzo at 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