How can I format the string according to its length at runtime?

Skip Montanaro skip at
Tue Jun 19 18:16:24 EDT 2001

    ed> I am trying to supply the precision formating at run time:
    ed> s = 123
    ed> print '(0x%-6X -)'%s

    ed> where I try to dynamically supply the number 6 from (6- length of s), 
    ed> I can't find a way to dynamically supply that. 

Check here:

Basically, you put * where you want to interpolate the width from a number:

    >>> wid = 12
    >>> print '(0x%*s)' % (wid, "allan")
    (0x       allan)

Skip Montanaro (skip at

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