simplify printing of a list

[Eru]

beliavsky at aol.com escribio:
> To print a list with a specified format one can write (for example)
> 
> for j in [0,1,2]:
>    print "%6d"%j,
> print
> 
> The code
> 
> print "%6d"%[0,1,2]
> 
> currently produces a syntax error, but it would be convenient if it
> had the same meaning as the loop above.
> 
> One can write a function to print a list, for example
> 
> def print_list(x,fmt_x="%6d"):
>    """ print a list on one line """
>    for y in x: print fmt_x % y,
> 
> print_list([0,1,2])

How about using:

def fmtlst(fmt,lst):
    return fmt*len(lst) % tuple(lst)

print fmtlst("%3d",range(5)), fmtlst("%5.2f", [1.2, 3, 4.567])

This prints:

  0  1  2  3  4  1.20 3.00 4.57

Maybe it gets your job done (though it's not the most efficient thing
one can do...)

> 
> but it gets messy to print several lists on the same line.
> 
> In Fortran 90/95 one can write 
> 
> print "(100i6)",(/0,1,2/)
> 
> where the format (100i6) means that UP TO 100 integers are printed
> using 6 columns. An alternative suggestion I have for Python is to
> allow
> 
> print "100%6d"%[0,1,2]

It looks a bit weird (unpythonic) to me, and we can use workarounds :)

> 
> with the same meaning.
> 
> I realize that what I am asking for is just a convenience, but it is
> one that I could use in almost every program I write.

-- 
Daniel Ripolles ( Eru )
Make Source, Not War
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