Difference in formatting list and tuple values

[Corrado Gioannini]

that's because the string formatting syntax requires a tuple (and not a
list) as the argument after the "%". 
t[:1] is a tuple, l[:1] is a list.

corrado.

On Thu, Dec 13, 2001 at 10:00:56AM -0700, Sue Giller wrote:
> I am trying to format values from either a list or a tuple, and I am 
> getting the following odd (to me) behavior.   I can format the tuple 
> entry using %d, but I get an error when I use the same formatting 
> for the same data in a list.
> Why does this happen?
> 
> >>> l = [1,2,3]						# list
> >>> t = (1,2,3)						# tuple
> >>> print "%02d" % t[:1]			# format first entry in tuple ok
> 01
> >>> print "%02d" % l[:1]			# get error with list
> Traceback (most recent call last):
>   File "<interactive input>", line 1, in ?
> TypeError: an integer is required
> >>> print "%02d" % tuple(t[:1])		# cast to a tuple works ok
> 01
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list

-- 
Corrado Gioannini
<gioco at nekhem.com>

"Thought is only a flash between two long nights,
                                         but this flash is everything."
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