making a valid file name...

[Matthew Warren]

> 
> Hi I'm writing a python script that creates directories from user
> input.
> Sometimes the user inputs characters that aren't valid 
> characters for a
> file or directory name.
> Here are the characters that I consider to be valid characters...
> 
> valid =
> ':./,^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ '
> 
> if I have a string called fname I want to go through each character in
> the filename and if it is not a valid character, then I want 
> to replace
> it with a space.
> 
> This is what I have:
> 
> def fixfilename(fname):
> 	valid =
> ':.\,^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ '
> 	for i in range(len(fname)):
> 		if valid.find(fname[i]) < 0:
> 			fname[i] = ' '
>        return fname
> 
> Anyone think of a simpler solution?
> 

I got;

>>> import re
>>> badfilename='£"%^"£^"£$^ihgeroighroeig3645^£$^"knovin98u4#346#1461461'
>>> valid=':./,^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ '
>>> goodfilename=re.sub('[^'+valid+']',' ',badfilename)
>>> goodfilename
'   ^  ^   ^ihgeroighroeig3645^  ^ knovin98u4 346 1461461'



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