[Tutor] String formatting

[Kent Johnson]

Ah, thanks for the explanation. I've never been tripped up by that...

Kent

Pierre Barbier de Reuille wrote:
> Kent Johnson a écrit :
> 
>>Pierre Barbier de Reuille wrote:
>>
> 
> [...]
> 
>>
>>>Well, when using the "%" operator on string always put a tuple or a
>>>dictionnary on the RHS :
>>>
>>>print "Connection from %s" % (info,)
>>
>>
>>No, you can put a single item on the right without putting it in a tuple:
>> >>> print 'x = %s' % 3
>>x = 3
>>
> 
> 
> I never said it does not work, but I say it is Bad Practice (TM). The
> reason (as I already explained) is, if the variable suddently happen to
> become a tuple the semantic of your print statement will change !
> 
> Just try that if you're not convinced :
> 
> 
>>>>def foo(x):
> 
> ...   print "x = %s" % x
> 
> 
>>>>foo(3)
> 
> 
>>>>foo((3,))
> 
> 
>>>>foo((1,2,3))
> 
> 
> Now, if you change the function with :
> 
> 
>>>>def foo(x):
> 
> ...   print "x = %s" % (x,)
> 
> It will always work as intended ! And when you're debugging this is
> *very* important !
> 
> Pierre
>