[Tutor] padding frames

[Danny Yoo]

On Sat, 10 Jan 2004, Christopher Spears wrote:

> I'm trying to figure out way to use Python to pad frames.  The name of
> the frames follow the this format DSCN-2.JPG.  What would be the best
> strategy to use Python to convert DSCN-2.JPG to DSCN-0002.JPG?

Hi Christopher,


There's a padding method in strings called 'zfill':

###
>>> '42'.zfill(4)
'0042'
###

So using zfill() on the numeric portion of each of your filenames should
do the trick.  Doing zfill() directly on filenames like:

###
>>> 'dsnc-2.jpg'.zfill(4)
'dsnc-2.jpg'
###

won't work.  But if we can somehow extract the numeric portion, then we
should be in business:

###
>>> 'dsnc-' + '2'.zfill(4) + '.jpg'
'dsnc-0002.jpg'
###


If you have more questions on this, please feel free to ask.  Good luck!