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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Fri, 6 May 2011 13:54:52 -0600
Subject: Re: string formatting
To: harrismh777 <harrismh777@charter.net>
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On Fri, May 6, 2011 at 1:39 PM, harrismh777 <harrismh777@charter.net> wrote=
:
> harrismh777 wrote: =A0 =A0OP wrote:
>
>> (1) "the %s is %s" % ('sky', 'blue')
>>
>> (2) "the {0} is {1}".format('sky', 'blue')
>>
>> (3) "the {} is {}".format('sky', 'blue')
>
> =A0 On the other hand, consider this 3.x code snip:
>
> =A0 print("the %s is %d" % ('sky', 'blue'))
>
>
> =A0 That formatting will throw an exception, because the format construct=
 is
> restricting the format entry to be a number, which 'blue' clearly isn't..=
..

If you used %d, then that exception is presumably what you wanted.  If
not, then you should just do:

print("the %s is %s" % ('sky', 'blue'))

> =A0 The following print() is better, because *any* time or *most* types c=
an be
> substituted and the 'polymorphism' of Python kicks in allowing for that, =
as
> so:

'%s' has exactly the same degree of polymorphism as '{}', because both
simply call str() on their argument.  There are good reasons to use
format instead of % if possible, but polymorphism isn't one of them.