[Tutor] Creating new files w/o overwriting existing ones

[Dick Moores]

Sorry if my Subject line isn't clear about what my question is.

I have a script that uses the turtle and random modules to create SVG 
files, one after another, in a directory just for the SVGs. The 
script assigns filenames in the form, "n.svg", where n is an integer. 
E.g. 1.svg, 2.svg. 3.svg, ... 44.svg, 45.svg. As it is now, I have to 
reset the starting integer when restarting the script, so as to not 
overwrite the files already created. Thus if the highest number 
filename is 45.svg, I have to configure the script so that it begins 
to create SVGs with filenames of 46.svg on up.

I'm hoping to add a function that will find find that highest number 
filename in the directory. Is this possible?

I should add that the numbers of the existing files will not 
necessarily be consecutive. There could be gaps. E.g., 4.svg., 
5.svg., 8.svg, 9.svg.

Thanks,

Dick Moores
Win XP
Python 2.5