print format

[Dave Angel]

Gabriel Genellina wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">En Tue, 
> 15 Dec 2009 00:28:11 -0300, Dave Angel <davea at ieee.org> escribió:
>> mattia wrote:
>
>>> Hi all, I wanto to print just the first 5 characters of a string, 
>>> why this doesn't work (py3.1)?
>>>
>>>>>> print("{0:5}".format("123456789"))
>>>>>>
>>> 123456789
>>> I know I could use print("123456789"[:5]), yeah it's a stupid 
>>> example, but isn't format for string formatting?
>>>
>> The width field of the format is a *minimum* width.  So you can use 
>> it to force padding, but not truncation.  If you need the string 
>> truncated, just use slicing, as you already showed.
>
> Or use the .precision specifier:
>
> py> "{0:.5}".format("123412341234")
> '12341'
>
> {0:5.5} has the same effect. See 
> http://docs.python.org/library/string.html#format-string-syntax
>
Whoa!   i never realized you could use precision on strings.  I knew 
(the hard way) that it won't work on ints, but I never thought to try it 
on strings.

Thanks.
DaveA